I've stated in the preface to the first edition of this work, and in the zoology of the voyage of the Beagle, that it was in consequence of a wish expressed by Captain Fitzroy of having some scientific person on board, accompanied by an offer from him of giving up part of his own accommodations that I volunteered my services, which received, through the kindness of the hydrographer, Captain Beaufort, the sanction of the lords of the Admiralty. As I feel that the opportunities which I enjoyed of studying the natural history of the different countries we visited have been wholly due to Captain Fitzroy, I hope I may here be permitted to repeat my expression of gratitude to him. And to add that, during the five years we were together, I received from him the most cordial friendship and steady assistance. Both to Captain Fitzroy and to all the officers of the Beagle, I shall ever feel most thankful for the undeviating kindness with which I was treated during our long voyage. This voyage contains, in the form of a journal, a history of our voyage, and a sketch of those observations in natural history and geology, which I think will possess some interest for the general reader. I have in this edition largely condensed and corrected some parts, and have added a little to others in order to render the volume more fitted for popular reading. But I trust that naturalists will remember that they must refer for details to the larger publications, which comprise the scientific results of the expedition. The zoology of the voyage of the Beagle includes an account of the fossil mammalia by Professor Owen, of the living mammalia by Mr. Waterhouse, of the birds by Mr. Gould, of the fish by the reverend L. Jennings, and of the reptiles by Mr. Bell. I have appended to the descriptions of each species an account of its habits and range. These works, which I owe to the high talents and disinterested zeal of the above distinguished authors, could not have been undertaken had it not been for the liberality of the Lord's commissioners of Her Majesty's Treasury, who, through the representation of the right honorable the Chancellor of the Exchequer, have been pleased to grant a sum of one thousand pounds towards defraying part of the expenses of publication. I have myself published several volumes on the structure and distribution of coral reefs, on the volcanic islands visited during the voyage of the Beagle, and on the geology of South America. The sixth volume of the geological transactions contain two papers of mine, on the erratic boulders and volcanic phenomena of South America. Mr. Waterhouse, Walker, Newman, and White have published several able papers on the insects which were collected, and I trust that many others will hear after follow. The plants from the southern parts of America will be given by Dr. J. Hooker in his great work on the botany of the southern hemisphere. The flora of the Galapagos Archipelago is the subject of a separate memoir by him in the Linnaean Transactions. The Reverend Professor Henslow has published a list of the plants collected by me at the Keeling Islands, and the Reverend J. M. Berkeley has described my cryptogamic plants. I shall have the pleasure of acknowledging the great assistance which I have received from several other naturalists in the course of this and my other works, but I must here be allowed to return my most sincere thanks to the Reverend Professor Henslow, who, when I was an undergraduate at Cambridge, was one chief means of giving me a taste for natural history, who, during my absence, took charge of the collections I sent home, and by his correspondence directed my endeavors, and who, since my return, has constantly rendered me every assistance which the kindest friend could offer. Down, Bromley, Kent, June 1845, End of Author's Preface. CHAPTER I Pallagic Confervae and Infusoria Causes of Discolored Sea After having been twice driven back by heavy southwestern gales, Her Majesty's ship Beagle, a ten-gun brig under the command of Captain Fitzroy, Royal Navy, sailed from Devonport on the 27th of December, 1831. The object of the expedition was to complete the survey of Patagonia and Tierra del Fuego, commenced under Captain King, in 1826 to 1830, to survey the shores of Chile, Peru, and some of the islands in the Pacific, and to carry a chain of chronometrical measurements round the world. On the 6th of January we reached Tenerife, but were prevented landing, by fears of our bringing the cholera. The next morning we saw the sun rise behind the rugged outline of the Grand Canary Island, and suddenly illuminate the peak of Tenerife, whilst the lower parts were veiled in fleecy clouds. This was the first of many delightful days never to be forgotten. On the 16th of January, 1832, we anchored at Porto Praia, in Sanjavu, the chief island of the Cap de Verde archipelago. The neighborhood of Porto Praia, viewed from the sea, wears a desolate aspect. The volcanic fires of a past age, and the scorching heat of a tropical sun have, in most places, rendered the soil unfit for vegetation. The country rises in successive steps of table-land, interspersed with some truncate conical hills, and the horizon is bounded by an irregular chain of more lofty mountains. The scene, as beheld through the hazy atmosphere of this climate, is one of great interest. If indeed a person, fresh from sea, and who has just walked for the first time in a grove of coconut trees, can be a judge of anything but his own happiness. The island would generally be considered as very uninteresting, but to any one accustomed only to an English landscape, the novel aspect of an utterly sterile land possesses a grandeur which more vegetation might spoil. A single green leaf can scarcely be discovered over wide tracts of the lava plains, yet flocks of goats, together with a few cows, contrive to exist. It rains very seldom, but during a short period of the year heavy torrents fall, and immediately afterwards a light vegetation springs out of every crevice. This soon withers, and upon such naturally-formed hay the animals live. It had not now rained for an entire year. When the island was discovered, the immediate neighborhood of Port Le Praia was clothed with trees. I state this on the authority of Dr. E. Difenbach, in his German translation of the first edition of this journal. The reckless destruction of which is caused here as at St. Helena and at some of the Canary Islands almost entires sterility. The broad, flat-bottomed valleys, many of which serve during a few days only in the season as water-courses, are clothed with thickets of leafless bushes. Few living creatures inhabit these valleys. The commonest bird is a kingfisher, Dacello Iagoensis, which tamely sits on the branches of the castor-oil plant, and thence darts on grasshoppers and lizards. It is brightly colored, but not so beautiful as the European species. In its flight, manors and place of habitation, which is generally in the driest valley, there is also a wide difference. One day, two of the officers and myself rode to Ribera Granji, a village a few miles eastward of Porto Praia. Until we reached the valley of St. Martin, the country presented its usual dull-brown appearance. But here, a very small rill of water produces a most refreshing margin of luxuriant vegetation. In the course of an hour we arrived at Ribera Granji, and were surprised at the sight of a large ruined fort and cathedral. This little town, before its harbor was filled up, was the principal place in the island. It now presents a melancholy but very picturesque appearance. Having procured a black padre for a guide, and a Spaniard who had served in the peninsular war as an interpreter, we visited a collection of buildings, of which an ancient church formed the principal part. It is here the governors and captain-generals of the islands have been buried. Some of the tombstones recorded dates of the 16th century. The Cavitevaire Islands were discovered in 1449. There was a tombstone of a bishop with the date of 1571, and a crest of a hand and dagger dated 1497. The heraldic ornaments were the only things in this retired place that reminded us of Europe. The church or chapel formed one side of a quadrangle, in the middle of which a large clump of bananas were growing. On another side was a hospital, containing about a dozen miserable-looking inmates. We returned to the Venda to eat our dinners. A considerable number of men, women, and children, all as black as jet, collected to watch us. Our companions were extremely merry, and everything we said or did was followed by their hearty laughter. Before leaving the town we visited the cathedral. It does not appear so rich as the smaller church, but boasts of a little organ which sent forth singularly inharmonious cries. We presented the black priest with a few shillings, and the Spaniard patting him on the head said, with much candor, he thought his color made no great difference. Then we then returned, as fast as the ponies would go, to Porta Praia. Another day we rode to the village of Santa Mingo, situated near the center of the island. On a small plain which we crossed, a few stunted acacias were growing. Their tops had been bent by the steady trade wind in a singular manner, some of them even at right angles to their trunks. The direction of the branches was exactly northeast by north and southwest by south, and these natural veins must indicate the prevailing direction of the force of the trade wind. The traveling had made so little impression on the barren soil, that we here missed our trek, and took that to Fuentes. This we did not find out till we arrived there, and we were afterwards glad of our mistake. Fuentes is a pretty village, with a small stream, and everything appeared to prosper well, accepting, indeed, that which ought to do so most, its inhabitants. The black children, completely naked, and looking very wretched, were carrying bundles of firewood, half as big as their own bodies. Near Fuentes we saw a large flock of guinea fowl, probably fifty or sixty in number. They were extremely wary and could not be approached. They avoided us, like partridges, on a rainy day in September, running with their heads cocked up, and, if pursued, they readily took to the wing. The scenery of Santo Mingo possesses a beauty totally unexpected, from the prevalent gloomy character of the rest of the island. The village is situated at the bottom of a valley, bounded by lofty and jagged walls of stratified lava. The black rocks afford a most striking contrast with the bright green vegetation, which follows the banks of a little stream of clear water.  On our return we overtook a party of about twenty young black girls, dressed in excellent taste. Their black skins and snow-white linen, being set off by colored turbans and large shawls. As soon as we approached near, they suddenly all turned round, and, covering the path with their shawls, sung with great energy a wild song, beating time with their hands upon their legs. We threw them some vintanes, which were received with screams of laughter, and we left them redoubling the noise of their song. One morning the view was singularly clear, the distant mountains being projected with the sharpest outline on a heavy bank of dark blue clouds. Judging from the appearance, and from similar cases in England, I suppose that the air was saturated with moisture. The fact, however, turned out quite the contrary. The hygrometer gave a difference of twenty-nine point six degrees between the temperature of the air and the point at which dew was precipitated. This difference was nearly double that which I had observed on the previous mornings. This unusual degree of atmospheric dryness was accompanied by continual flashes of lightning. Is it not an uncommon case, thus to find a remarkable degree of aerial transparency with such a state of weather? Generally the atmosphere is hazy, and this is caused by the falling of impalcably fine dust, which was found to have slightly injured the astronomical instruments. The morning before we anchored at Port de Praia, I collected a little packet of this brown-colored fine dust, which appeared to have been filtered from the wind by the gauze of the vein at the mast head. Mr. Lyle has also given me four packets of dust which fell on a vessel a few hundred miles northward of these islands. Professor Ehrenberg finds that this dust consists in great part of infusoria, with salacious shields and none of the salacious tissue of plants. I must take this opportunity of acknowledging the great kindness with which this illustrious naturalist has examined many of my specimens. I have sent, June 1845, a full account of the falling of this dust to the geological society. In five little packets which I sent him, he has ascertained no less than sixty-seven different organic forms. The infusoria, with the exception of two marine species, are all inhabitants of fresh water. I have found no less than fifteen different accounts of dust having fallen on vessels when far out in the Atlantic. From the direction of the wind whenever it has fallen, and from its having always fallen during those months when the Hamilton is known to raise clouds of dust high into the atmosphere, we may feel sure that it all comes from Africa. It is, however, a very singular fact that, although Professor Ehrenberg knows many species of infusoria peculiar to Africa, he finds none of these in the dust which I sent him. On the other hand, he finds it in two species which hitherto he knows is living only in South America.  The waters have even run on shore owing to the obscurity of the atmosphere. It has often fallen on ships when several hundred and even more than a thousand miles from the coast of Africa, and it points sixteen hundred miles distant in a north and south direction. In some dust which was collected on a vessel three hundred miles from the land, I was much surprised to find particles of stone above the thousandth of an inch square mixed with finer matter. After this fact one need not be surprised at the diffusion of the far lighter and smaller sporegals of cryptogamic plants. The geology of this island is the most interesting part of its natural history. On entering the harbor a perfectly horizontal white band in the face of the sea-cliff may be seen running for some miles along the coast, and at the height of about forty-five feet above the water. On examination this white stratum is found to consist of calcarius matter with numerous shells embedded, most or all of which now exist on the neighboring coast. It rests on ancient volcanic rocks, and has been covered by a stream of basalt which must have entered the sea while the white shelly-bed was lying at the bottom. It is interesting to trace the changes produced by the heat of the overlying lava on the friable mass, which in parts has been converted into a crystalline limestone, and, in other parts, into a compact spotted stone, where the lime has been caught up by the scouracious fragments of the lower surface of the stream. It is converted into groups of beautifully radiated fibers, resembling a ragonite. The beds of lava rise in successive gently sloping planes towards the interior, whence the deluges of melted stone have originally proceeded. Within historical times no signs of volcanic activity have, I believe, been manifested in any part of St. Jagal. Even the form of a crater can but rarely be discovered on the summits of the many red, cindery hills. Yet the more recent streams can be distinguished on the coast, forming lines of cliffs of less height, but stretching out in advance of those belonging to an older series, the height of the cliffs, thus affording a rude measure of the age of the streams.   This sea slug is about five inches long, and is of a dirty yellowish color, veined with purple. On each side of the lower surface, or foot, there is a broad membrane, which appears sometimes to act as a ventilator, in causing a current of water to flow over the dorsal branchier or lungs. It feeds on the delicate seaweeds which grow among the stones in muddy and shallow water. And I found in its stomach several small pebbles as in the gizzard of a bird. This slug, when disturbed, emits a very fine, purplish red fluid, which stains the water for the space of a foot around. By this means of defense, an acrid secretion which is spread over its body causes a sharp stinging sensation, similar to that produced by the Faisalia or Portuguese man of war. I was much interested, on several occasions, by watching the habits of an octopus or cuttlefish. Although common in the pools of water left by the retiring tide, these animals were not easily caught, by means of their long arms and suckers. They could drag their bodies into very narrow crevices, and, when thus fixed, it required great force to remove them. At other times they darted tail first, with the rapidity of an arrow from one side of the pool to the other, at the same instant discoloring the water with a dark chestnut brown ink. These animals also escaped detection by a very extraordinary chameleon-like power of changing their color. They appeared to vary their tints according to the nature of the ground over which they pass. When in deep water, their general shade was brownish purple, but when placed on the land, or in shallow water, this dark tint changed into one of a yellowish green. The color, examined more carefully, was a French gray, with numerous minute spots of bright yellow. The former of these varied in intensity. The latter entirely disappeared, and appeared again by turns. These changes were affected in such a manner that clouds, varying in tint between a hyacinth red and a chestnut brown, were continually passing over the body. So named, according to Patrick Steim's nomenclature, any part being subjected to a slight shock of galvanism, became almost black, a similar effect, but in a less degree was produced by scratching the skin with a needle. These clouds, or blushes as they may be called, are said to be produced by the alternate expansion and contraction of minute vesicles containing variously colored fluids. See the Encyclopedia of Anatomy and Physiology, article Cephalopoda. This cuttlefish displayed its chameleon-like power both during the act of swimming and whilst remaining stationery at the bottom. I was much amused by the various arts to escape detection used by one individual, which seemed fully aware that I was watching it. Remaining for a time motionless, it would then stealthily advance an inch or two, like a cat after a mouse, sometimes changing its color, it thus proceeded, till, having gained a deeper part, it darted away, leaving a dusky train of ink, to hide the hole into which it had crawled. While looking for marine mammals with my head about two feet above the rocky shore, I was more than once saluted by a jet of water, accompanied by a slight grating noise. At first I could not think what it was, but afterwards I found out that it was this cuttlefish, which, though concealed in a hole, thus often led me to its discovery, that it possesses the power of ejecting water there is no doubt, and it appeared to me that it could certainly take good aim by directing the tube or siphon on the underside of its body. From the difficulty which these animals have in carrying their heads they cannot crawl with ease when placed on the ground. I observed that one which I kept in the cabin was slightly phosphorescent in the dark, St. Paul's Rocks. In crossing the Atlantic we hove, too, during the morning of February 16th, close to the island of St. Paul's. This cluster of rocks is situated in zero degrees, 58 minutes north latitude, and 29 degrees, 15 minutes west longitude. It is 540 miles distant from the coast of America, and 350 from the island of Fernando de Noronha. The highest point is only 50 feet above the level of the sea, and the entire circumference is under three-quarters of a mile. This small point rises abruptly out of the depths of the ocean. Its mineralogical constitution is not simple. In some parts the rock is of a churty, in others of a felspathic nature, including thin veins of serpentine. It is a remarkable fact that all the many small islands lie in far from any continent in the Pacific, Indian, and Atlantic Oceans, with the exception of the Seychelles. And this little point of rock are, I believe, composed either of coral or of erupted matter. The volcanic nature of these oceanic islands is evidently an extension of that law, and the effect of those same causes, whether chemical or mechanical, from which results that a vast majority of the volcanoes now in action stand either near seacoast or as islands in the midst of the sea. The rocks of St. Paul appear from a distance of a brilliantly white color. This is partly owing to the dung of a vast multitude of seafowl, and partly to a coating of a hard, glossy substance with a pearly luster, which is intimately united to the surface of the rocks. This, when examined with a lens, is found to consist of numerous exceedingly thin layers, its total thickness being about the tenth of an inch. It contains much animal matter, and its origin, no doubt, is due to the action of the rain or spray on the birds' dung. Below some small masses of guanoa de ascension and on the Aprollios islets, I found a certain stalactic branching bodies formed apparently in the same manner as the thin white coating on these rocks. The branching bodies so closely resembled in general the appearance, certain Nullapore, a family of hard calcerous sea plants, that in lately looking hastily over my collection, I did not perceive the difference. The globular extremities of the branches are of a pearly texture, like the enamel of teeth, but so hard as just to scratch plate glass. I may here mention that on a part of the coast of Ascension, where there is a vast accumulation of shelly sand, an incrustation is deposited on the tidal rocks by the water of the sea, resembling, as represented in the woodcut, certain cryptogenic plants, Marchantier, often seen on damp walls. The surface of the fronds is beautifully glossy, and those parts formed wherefully exposed to the light are of a jet black color, but those shaded under ledges are only gray. I have shown specimens of this incrustation to several geologists, and they all thought that they were a volcanic or igneous origin. In its hardness and translucency, in its polish equal to that of the finest Aliva shell, in the bad smell given out, and the loss of color under the blowpipe, it shows a close similarity with living seashells. Moreover, in seashells, it is known that the parts habitually covered and shaded by the mantle of the animal are of a paler color than those fully exposed to the light, just as is the case with this incrustation. When we remember that lime, either as a phosphate or carbonate, enters into the composition of the hard parts, such as bones and shells of all living animals, is an interesting physiological fact to find substances harder than the enamel of teeth, and colored surfaces as well polished as those of a fresh shell reformed through inorganic means from dead organic matter. Mocking also, in shape, some of the lower vegetable productions. Mr. Horner and Sir David Brewster have described, in philosophical transactions, 1836, page 65, a singular artificial substance resembling shell. It is deposited in fine, transparent, highly polished, brown-colored laminate, possessing peculiar optical properties on the inside of a vessel, in which cloth, first prepared with glue and then with lime, is made to revolve rapidly in water. It is much softer, more transparent, and contains more animal matter than the natural incrustation at ascension. But we here again see the strong tendency which carbonate of lime and animal matter evinced to form a solid substance allied to shell. We found on St. Paul's only two kinds of birds, the booby and the naughty. The former is a species of guannet, and the latter a turn.  The booby lays her eggs on the bare rock, but the turn makes a very simple nest with seaweed. By the side of many of these nests a small flying fish was placed, which I suppose had been brought by the male bird for its partner. It was amusing to watch how quickly a large and active crab, Graspus, which inhabits the crevices of the rock, stole the fish from the side of the nest, as soon as we had disturbed the parent birds. Sir W. Simons, one of the few persons who have landed here, informs me that he saw the crabs dragging even the young birds out of their nests and devouring them. Not a single plant, not even a lichen, grows on this islet, yet it is inhabited by several insects and spiders. The following list completes, I believe, the terrestrial fauna, a fly, Ophersia, living on the booby, and a tick, which must have come here as a parasite on the birds, a small brown moth belonging to a genus that feeds on feathers, a beetle, quadeus, and a woodlouse beneath the dung, and lastly numerous spiders, which I suppose prey on these small attendants and scavengers of the waterfowl. The often repeated description of the stately palm, and other noble tropical plants, then birds, and lastly man taking possession of the coral islets, as soon as formed in the Pacific, is probably not correct. I fear it destroys the poetry of this story, that feather and dirt feeding parasitic insects and spiders should be the first inhabitants of the newly formed oceanic land. The smallest rock in the tropical seas, by giving a foundation for the growth of innumerable kinds of sea-weak and compound animals, supports likewise a large number of fish. The sharks and the seaman and the boats maintained a constant struggle, which should secure the greater share of the prey caught by the fishing-lines. I have heard that a rock near the Bermudas, laying many miles out at sea, and at a considerable depth, was first discovered by the circumstance of fish having been observed in the neighborhood. End of Chapter 1, Part 1, Recording by Scott Robbins, Chapter 1, Part 2 of The Voyage of the Beagle. This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, please visit LibriVox.org. The Voyage of the Beagle, by Charles Darwin. Chapter 1, Part 2, St. Jago, Capigiver Islands, Fernando Noronja, February 20th. As far as I was enabled to observe, during the few hours we stated this place, the constitution of the island is volcanic, but probably not of a recent date. The most remarkable feature is a conical hill, about 1,000 feet high, the upper part of which is exceedingly steep, and on one side overhangs its base. The rock is phonolite, and is divided into irregular columns. Unviewing one of these isolated masses, at first one is inclined to believe that it has been suddenly pushed up in a semi-fluid state. At Santa Helena, however, I ascertain that some pinnacles of a nearly similar figure in constitution had been formed by the injection of melted rock into yielding strata, which thus had formed the molds for these gigantic obelisks. The whole island is covered with wood, but from the dryness of the climate there is no appearance of luxuriance. Halfway up the mountain some great masses of the columnar rock shaded by laurel trees and ornamented by others covered with fine pink flowers, but without a single leaf, gave an pleasing effect to the nearer parts of the scenery. Bahia, or San Salvador, Brazil, February 29. The day has passed delightfully. Delight itself, however, is a weak term to express the feelings of a naturalist, who, for the first time, has wandered by himself in a Brazilian forest. The elegance of the grasses, the novelty of the parasitical plants, the beauty of the flowers, the glossy green of the foliage, but above all the general luxuriance of the vegetation filled me with admiration. A most paradoxical mixture of sound and silence pervades the shady parts of the wood. The noise from the insects is so loud that it may be heard even in a vessel anchored several hundred yards from the shore. Yet within the recesses of the forest a universal silence appears to reign. To a person found of natural history, such a day as this brings with it a deeper pleasure, then he can ever hope to experience again. After wandering about for some hours I returned to the landing-place, but before reaching it I was overtaken by a tropical storm. I tried to find shelter under a tree, which was so thick that it would never have been penetrated by common English rain. But here, in a couple of minutes, a little torrent flowed down the trunk. It is to this violence of the rain that we must attribute the verger at the bottom of the thickest woods. If the showers were like those of a colder climate, the greater part would be absorbed or evaporated before it reached the ground. I will not at present attempt to describe the gaudy scenery of this noble bay, because in our homeward voyage we called here a second time, and I shall then have occasion to remark on it. Along the whole coast of Brazil, for a length of at least two thousand miles, and certainly for a considerable space inland, wherever solid rock occurs it belongs to a granitic formation. The circumstance of this enormous area being constituted of materials which most geologists believe to have been crystallized when heated under pressure gives rise to many curious reflections. Was this effect produced beneath the depths of a profound ocean, or did a covering of strata formally extend over it which has since been removed? Can we believe that any power acting for a time short of infinity could have denuded the granite over so many thousand square leagues? On a point not far from the city, where a rivulet entered the sea, I observed effect connected with a subject discussed by Humboldt in his personal narration, Volume 5, Part 1, page 18. At the cataracts of the Great Rivers, or Anoco, Nile, and Congol, the cyanidic rocks are coated by a black substance, appearing as if they had been polished with plumbago. The layers of extreme thinness and non-analysis by Barizelius it was found to consist of the oxides of manganese and iron. In the Orinoco it occurs on the rocks periodically washed by the floods, and in those parts alone where the stream is rapid, or as the Indians say, the rocks are black where the waters are white. Here the coating is of a rich brown instead of a black color, and seems to be composed of ferruginous matter alone. Hand specimens fail to give a just idea of these brown burnished stones which glitter in the sun's rays. They occur only within the limits of the tidal waves, and as the rivulet slowly trickles down, the surf must supply the polishing power of the cataracts in the Great Rivers. In like manner the rise and fall of the tide probably answer to the periodical inundations, and thus the same effects are produced under apparently different but really similar circumstances. The origin, however, of these coatings of metallic oxides, which seem as if cemented to the rocks, is not understood, and no reason, I believe, can be assigned for their thickness remaining the same. One day I was amused by watching the habits of the diodon antinatus, which was caught swimming near the shore. This fish, with its flabby skin, is well known to possess the singular power of distending itself into a nearly spherical form. After having been taken out of the water for a short time, and then again immersed in it, a considerable quantity of both water and air is absorbed by the mouth, and perhaps likewise by the branquil orifices. This process is effected by two methods. The air is swallowed, and is then forced into the cavity of the body, its return being prevented by muscular contraction, which is externally visible, but the water enters in a gentle stream through the mouth, which is kept wide open and motionless. This latter action must therefore depend on suction. The skin about the abdomen is much looser than that on the back, hence, during the inflation, the lower surface becomes far more distended than the upper, and the fish in consequence floats with its back downwards. Cuvier doubts whether the diodon in this position is able to swim, but not only can it thus move forward in a straight line, but it can turn round to either side. This latter movement is affected solely by the aid of the pectoral fins, the tail being collapsed and not used. From the body being buoyed up with so much air, the branquil openings are out of water, but a stream drawn in by the mouth constantly flows through them. The fish, having remained in this distended state for a short time, generally expelled the air and water with considerable force from the branquil apertures and mouth. It could emit, at will, a certain portion of the water, and it appears therefore probable that this fluid is taken in partly for the sake of regulating its specific gravity. This diodon possessed several means of defense. It could give a severe bite, and could eject water from its mouth to some distance, at the same time making a curious noise by the movement of its jaws. By the inflation of its body, the papulae, with which the skin is covered, become erect and pointed, but the most curious circumstance is that it secretes from the skin of its belly when handled a most beautiful, carmine red fibrous matter, which stains ivory and paper in so permanent a manner that the tint is retained with all its brightness to the present day. I am quite ignorant of the nature and use of this secretion. I have heard from Dr. Alan of Foris that he has frequently found a diodon floating alive and distended in the stomach of the shark, and that on several occasions he is known it eats its way not only through the coats of the stomach, but through the sides of the monster, which has thus been killed. Who would ever have imagined that a little soft fish could have destroyed the great and savage shark? March 18. We sailed from Bahia. A few days afterwards, when not far distant from the Abrolius Islets, my attention was called to a reddish-brown appearance in the sea. The whole surface of the water, as it appeared under a weak lens, seemed as if covered by chopped bits of hay with their ends jagged. These are my new cylindrical confervae, and bundles of rafts from twenty to sixty in each. Mr. Berkeley informs me that they are the same species, trichodesmium erythriam. With that found over large spaces in the Red Sea, and whence its name of Red Sea is derived. Their numbers must be infinite. The ship passed through several bands of them, one of which was about ten yards wide, and, judging from the mud-like color of the water, at least two and a half miles long. In almost every long voyage some account is given of these confervae. They appear especially common in the sea near Australia, and off Cape Leowen I found an allied but smaller and apparently different species. Captain Cook in his third voyage remarks that the sailors gave to this appearance the name of Sea Sawdust. Near Keeling Atoll, in the Indian Ocean, I observed many little masses of confervae a few inches square, consisting of long cylindrical threads of excessive thinness, so as to be barely visible to the naked eye, mingled with other, rather larger bodies, finely conical at both ends. Two of these are shown in the woodcut united together. They vary in length from 0.04 to 0.06, and even to 0.08 of an inch in length, and in diameter from 0.006 to 0.008 of an inch. Near one extremity of the cylindrical part, a green septum formed of granular matter and thickest in the middle may generally be seen. This I believe is the bottom of the most delicate colorless sac, composed of a pulpy substance, which lines the exterior case, but does not extend within the extreme conical points. In some specimens, small but perfect spheres of brownish granular matter supplied the places of the septum, and I observed the curious process by which they were produced. The pulpy matter of the internal coating suddenly grouped itself into lines, some of which assumed a form radiating from a common center. It then continued with an irregular and rapid movement, to contract itself, so that in the course of a second the whole was united into a perfect little sphere, which occupied the position of the septum at one end of the now quite hollow case. The formation of the granular sphere was hastened by any accidental injury. I may add that frequently a pair of these bodies were attached to each other, as represented above, cone beside cone, at that end where the septum occurs. I will add here a few other observations connected with the discoloration of the sea from organic causes. On the coast of Chile, a few leagues north of Concepción, the beagle one day passed through great bands of muddy water, exactly like that of a swollen river, and again a degree south of Valparaiso, when fifty miles from the land the same appearance was still more extensive. Some of the water placed in a glass was of a pale reddish tint, and examined under a microscope was seen to swarm with minute animal cula darting about and often exploding. The shape is oval and contracted in the middle by a ring of vibrating curved ciliae. It was, however, very difficult to examine them with care, for almost the instant motion ceased, even while crossing the field of vision their bodies burst. Sometimes both ends burst at once, sometimes only one, and a quantity of course brownish granular matter was ejected. The animal, an instant before bursting, expanded to half again its natural size, when the explosion took place about fifteen seconds after the rapid progressive motion had ceased. In a few cases, it was preceded for a short interval by a rotary movement on the longer axis. About two minutes after any number were isolated in a drop of water, they thus perished. The animals moved with the narrow apex forwards, by the aid of their vibratory ciliae, and generally by rapid starts. They are exceedingly minute, and quite invisible to the naked eye, only covering a space equal to the square of the thousandth of an inch. Their numbers were infinite, for the smallest drop of water which I could remove contained very many. In one day we passed through two spaces of water thus stained, one of which alone must have extended over several square miles. What incalculable numbers of these microscopic animals? The color of the water, as seen at some distance, was like that of a river which has flowed through a red clay district, but under the shade of the vessel's side it was quite as dark as chocolate. The line where the red and blue water joined was distinctly defined. The weather, for some days previously, had been calm, and the ocean abounded to an unusual degree with living creatures. In the sea around Tierra del Fuego, and at no great distance from the land, I have seen narrow lines of water with a bright red color, from the number of crustacea which somewhat resemble in form large prawns. The sealers call them whale food. Whether whales feed on them I do not know, but turns, cormorants, and immense herds of great unwieldy seals derive, on some parts of the coast, their chief sustenance from these swimming crabs. Seaman invariably attribute the discoloration of the water to spawn, but I found this to be the case, only on one occasion. At the distance of several leagues from the archipelago of the Galapagos, the ship sailed through three strips of a dark yellowish or mud-like water. These strips were some miles long, but only a few yards wide, and they were separated from the surrounding water by a sinuous yet distinct margin. The color was caused by little gelatinous balls, about the fifth of an inch in diameter, in which numerous minute spherical ovules were embedded. They were of two distinct kinds, one being of a reddish color, and of a different shape from the other. I cannot form a conjecture as to what two kinds of animals these belonged. Captain Colnott remarks that this appearance is very common among the Galapagos Islands, and that the directions of the bands indicate that of the currents. In the described case, however, the line was caused by the wind. The only other appearance which I have to notice is a thin oily coat on the water, which displays iridescent colors. I saw a considerable tract of the ocean thus covered on the coast of Brazil. The seaman attributed it to the putrefying carcass of some whale, which probably was floating at no great distance. I do not here mention the minute gelatinous particles, hereafter to be referred to, which are frequently dispersed throughout the water, for they are not sufficiently abundant to create any change of color. There are two circumstances in the above accounts which appear remarkable. First, how do the various bodies which form the bands with defined edges keep together? In the case of the prawn-like crabs, their movements were as co-instantaneous as in a regiment of soldiers, but this cannot happen from anything like voluntary action with the ovules or the confervae, nor is it possible among the infusoria. Secondly, what causes the length and narrowness of the bands? The appearance so much resembles that which may be seen in every torrent, where the stream uncoils into long streaks, the froth collected in the eddies, that I must attribute the effect to a similar action either of the currents, of the air, or sea. Under this supposition we must believe that the various organized bodies are produced in certain favorable places, and are thenst removed by the set of either wind or water. I confess, however, there is a very great difficulty in imagining any one spot to be the birthplace of the millions of millions of animal cula and confervae. For whence come the germs at such points? The parent bodies having been distributed by the winds and waves over the immense ocean. But on no other hypothesis can I understand their linear grouping. I may add that Scoresby remarks that green water abounding with pelagic animals is in variably found in a certain part of the Arctic Sea. End of Chapter 1, Part 2, Recording by Scott Robbins. Chapter 2, Part 1 of The Voyage of the Beagle. This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, please visit LibriVox.org. The Voyage of the Beagle by Charles Darwin. Chapter 2, Part 1, Rio de Janeiro. Rio de Janeiro. Excursion north of Capafrio. Great evaporation. Slavery. Both Fogo Bay. Terrestrial planerier. Clouds on the Corcovado. Heavy rain. Musical frogs. Phosphorescent insects. Elator, springing powers of. Blue haze. Noise made by a butterfly. Entomology. Ants. Wasp killing a spider. Parasitical spider. Artifices of an epiera. Gregorius spider. Spider with an unsymmetrical web. April 4 to July 5, 1832. A few days after our arrival, I became acquainted with an Englishman who was going to visit his estate. Situated rather more than 100 miles from the capital to the northward of Capafrio. I gladly accepted his kind offer of allowing me to accompany him. April 8. Our party amounted to seven. The first stage was very interesting. The day was powerfully hot, and as we passed through the woods everything was motionless, except in the large and brilliant butterflies which lazily fluttered about. The view seen when crossing the hills behind Praia Grande was most beautiful. The colors were intense, and the prevailing tint a dark blue. The sky and the calm waters of the bay vied with each other in splendor. After passing through some cultivated country we entered a forest which, in the grandeur of all its parts, could not be exceeded. We arrived by midday at Ithacaia. This small village is situated on a plane, and round the central house are the huts of the Negroes. These reminded me of the drawings of the hot and taut habitations in southern Africa. As the moon rose early we determined to start the same evening for our sleeping place at the Lagoa Marica. As it was growing dark we passed under one of the massive bear and steep hills of granite which are so common in this country. This spot is notorious from having been, for a long time, the residence of some runaway slaves, who, by cultivating a little ground near the top, contrived to eke out a subsistence. At length they were discovered, and a party of soldiers being sent, the whole were seized with the exception of one old woman, who, sooner than again be led into slavery, dashed herself to pieces from the summit of the mountain. In a Roman matron this would have been called the noble love of freedom. In a poor Negroes it is mere brutal obstinacy. We continued riding for some hours. For the few last miles the road was intricate, and it passed through a desert waste of marshes and legumes. The scene, by the dimmed light of the moon, was most desolate. A few fireflies flitted by us, and the solitary snipe as it rose uttered its plaintive cry. The distant and sullen roar of the sea scarcely broke the stillness of the night. April 9. We left our miserable sleeping place before sunrise. The road passed through a narrow sandy plain, lying between the sea and the interior salt legumes. The number of beautiful fishing birds, such as egrets and cranes, and the succulent plants, assuming most fantastical forms, gave to the scene an interest which it would not otherwise have possessed. The few stunted trees were loaded with parasitical plants, among which the beauty and delicious fragrance of some of the orchidiae were most to be admired. As the sun rose the day became extremely hot, and the reflection of the light and heat from the white sand was very distressing. We dined at Mandetiba, the thermometer in the shade being 84 degrees. The beautiful view of the distant wooded hills reflected in the perfectly calm water of an extensive lagoon quite refreshed us. As the Venda, the Portuguese name for an inn, here was a very good one, and I have the pleasant but rare remembrance of an excellent dinner, I will be grateful and presently describe it as the type of its class. These houses are often large, and are built of thick upright posts, with boughs interwoven and afterwards plastered. They seldom have floors, and never glazed windows, but are generally pretty well-roofed. Universally the front part is open, forming a kind of veranda in which tables and benches are placed. The bedrooms join on each side, and here the passenger may sleep as comfortably as he can on a wooden platform covered by a thin straw mat. The Venda stands in a courtyard, where the horses are fed. On first arriving it was our custom to unsaddle the horses and give them their Indian corn, then, with a low bow, to ask the senor to do us the favor to give up something to eat. Anything you choose, sir, was his usual answer. For the first few times vainly I thanked Providence for having guided us to so good a man. The conversation proceeding, the case universally became deplorable. Any fish can you do us the favor of giving? Oh, no, sir. Any soup? No, sir. Any bread? Oh, no, sir. Any dried meat? Oh, no, sir. If we were lucky, by waiting a couple of hours, we obtained fowls, rice, and farinha. It not unfrequently happened that we were obliged to kill with stones the poultry for our own supper. When, thoroughly exhausted by fatigue and hunger, we tamorously hinted that we should be glad of our meal, the pompous and, though true, most unsatisfactory answer was, it will be ready when it is ready. If we had dared to remonstrate any further, we should have been told to proceed on our journey as being too impertinent. The hosts are most ungracious and disagreeable in their manners. Their houses and their persons are often filthfully dirty. The want of the accommodation of forks, knives, and spoons is common, and I am sure no cottage or hovel in England could be found in a state so utterly destitute of every comfort. At Campos Novos, however, we fared sumptuously, having rice and fowls, biscuit, wine, and spirits for dinner, coffee in the evening, and fish with coffee for breakfast. All this with good food for the horses only caused two shillings six pence per head. Yet the host of this venda, being asked if he knew anything of a whip which one of the party had lost, gruffly answered, How should I know? Why did you not take care of it? I suppose the dogs have eaten it. Leaving Montechiba, we continued to pass through an intricate wilderness of lakes, in some of which were fresh, and others salt-water shells. Of the former kinds I found a limnaya in great numbers in a lake, to which the inhabitants assured me that the sea enters once a year, and sometimes oftener, and makes the water quite salt. I have no doubt many interesting facts, in relation to marine and freshwater animals, might be observed in this chain of legumes which skirt the coast of Brazil. Monsieur Gaye has stated that he found in the neighborhood of Rio shells of the marine genera Solon and Mitulus, and freshwater Ampularie, living together in brackish water, and now descience nascred for 1833. I also frequently observed in the lagoon near the Botanic Garden, where the water is only a little less salt than the sea, a species of hydrophilus, very similar to a water beetle, common in the ditches of England. In the same lake, the only shell belonged to a genus, generally found in estuaries. During the coast for a time we again entered the forest. The trees were very lofty and remarkable, compared with those of Europe, from the whiteness of their trunks. I see by my notebook, wonderful and beautiful, flowering parasites, invariably struck me as the most novel object in these grand scenes. Traveling onwards we passed through tracks of pastureage, much injured by the enormous conical ants' nests, which were nearly twelve feet high. They gave to the plain exactly the appearance of the mud-volcanoes at Horulio, as figured by Humboldt. We arrived at Engi Yold, after it was dark, having been ten hours on horseback. I never ceased during the whole journey to be surprised at the amount of labour which the horses were capable of enduring. They appeared also to recover from any injury much sooner than those of our English breed. The vampire-bat is often the cause of much trouble, by biting the horses on their withers. The injury is generally not so much owing to the loss of blood, as to the inflammation which the pressure of the saddle afterwards produces. The whole circumstance has lately been doubted in England. I was, therefore, fortunate in being present when one, Desmodus Storbigny, was actually caught on a horse's back. We were bivouacking late one evening near Kokimbu, in Chile, when my servant, noticing that one of the horses was very restive, went to see what was the matter, and fancying he could distinguish something, suddenly put his hand on the beast's withers and secured the vampire. In the morning, the spot where the bite had been inflicted was easily distinguished, from being slightly swollen and bloody. The third day afterwards we rode the horse without any ill effects. After three days' traveling we arrived at Sosegu, the estate of Signor Manuel Figuireida, a relation of one of our party. The house was simple, and, though like a barn in form, was well suited to the climate. In the sitting-room gilded chairs and sofas were oddly contrasted with the whitewashed walls, thatched roof, and windows without glass. The house, together with the granaries, the stables and workshops for the blacks, who had been taught various trades, formed a rude kind of quadrangle, in the center of which a large pile of coffee was drying. These buildings stand on a little hill, overlooking the cultivated ground, and surrounded on every side by a wall of dark green luxuriant forest. The chief produce of this part of the country is coffee. Each tree is supposed to yield annually, on an average, two pounds, but some give as much as eight. Manjeuca, or casada, is likewise cultivated in great quantity. Every part of this plant is useful. The leaves and stalks are eaten by the horses, and the roots are ground into a pulp, which, when pressed dry and baked, forms the farinha, the principal article of sustenance in the Brazils. It is a curious, though well-known fact, that the juice of this most nutritious plant is highly poisonous. A few years ago a cow died at this fazenda, in consequence of having drunk some of it. Señor Figureida told me that he had planted the year before one bag of feijão, or beans, and three of rice, the former of which produced eighty, and the latter three hundred and twenty-fold. The pastureage supports a fine stalk of cattle, and the woods are so full of game that a deer had been killed on each of the three previous days. This profusion of food showed itself at dinner, where, if the tables did not groan, the guests surely did, for each person is expected to eat of every dish.  During the meals it was the employment of a man to drive out of the room sundry old hounds, and dozens of little black children which crawled in together at every opportunity. As long as the idea of slavery could be banished, there was something exceedingly fascinating in this simple and patriarchal style of living. It was such a perfect retirement in independence from the rest of the world. As soon as any stranger is seen arriving, a large bell is set tolling, and generally some small cannon are fired. The event is thus announced to the rocks and woods, but to nothing else. One morning I walked out an hour before daylight to admire the solemn stillness of the scene. At last the scene was broken by the morning hymn, raised on high by the whole body of the blacks, and in this manner their daily work is generally begun. On Fizendas such as these I have no doubt the slaves pass happy and contented lives. On Saturday and Sunday they work for themselves, and in this fertile climate the labor of two days is sufficient to support a man and his family for the whole week. April 14th. Leaving Sosebel we rode to another estate on the Hiomassai, which was the last patch of cultivated ground in that direction. The estate was two and a half miles long, and the owner had forgotten how many broad. Only a very small piece had been cleared, yet almost every acre was capable of yielding all the various rich productions of a tropical land. Considering the enormous area of Brazil, the proportion of cultivated ground can scarcely be considered as anything, compared to that which is left in this state of nature. At some future age how vast a population it will support.  The forest abounded with beautiful objects, among which the tree ferns, though not large, were from their bright green foliage and the elegant curvature of their fronds, most worthy of admiration. In the evening it rained very heavily, and although the thermometer stood at sixty-five degrees, I felt very cold. As soon as the rain ceased it was curious to observe the extraordinary evaporation which commenced over the whole extent of the forest.  I observed this phenomenon on several occasions. I suppose it is owing to the large surface of the foliage previously heated by the sun's rays. While staying at this estate I was very nearly being an eye witness to one of those atrocious acts which can only take place in a slave country. Owing to a quarrel and a lawsuit the owner was on the point of taking all the women and children from the male slaves, and selling them separately at the public auction at Rio. Interest and not any feeling of compassion prevented this act. Indeed, I do not believe the inhumanity of separating thirty families, who had lived together for many years, even occurred to the owner. Yet I will pledge myself that in humanity and good feeling he was superior to the common land of men. It may be said there exists no limit to the blindness of interest in selfish habit. I may mention one very trifling anecdote which at the time struck me more forcibly than any story of cruelty.  In endeavouring to make him understand I talked loud and made signs, in doing which I passed my hand near his face. He I suppose thought I was in a passion and was going to strike him, for instantly with a frightened look and half-shut eyes he dropped his hands. I shall never forget my feelings of surprise, disgust, and shame at seeing a great powerful man, afraid even to ward off the blow, directed as he thought at his face. This man had been trained to a degradation lower than the slavery of the most helpless animal, April 18th. In returning we spent two days at Sosego, and I employed them in collecting insects in the forest. The greater number of trees, although so lofty, are not more than three or four feet in circumference. There are, of course, a few of much greater dimensions. Seyur Manuel was then making a canoe seventy feet in length from a solid trunk which had originally been one hundred ten feet long, and of great thickness. The contrast of palm trees growing amidst the common branching-kinds never fails to give the scene an intertropical character. Here the woods were ornamented by the cabbage-pulm, one of the most beautiful of its family. With a stem so narrow that it might be clasped with the two hands, it waves its elegant head at the height of forty or fifty feet above the ground. The woody creepers, themselves covered by other creepers, were of great thickness, some which I measured were two feet in circumference. Many of the older trees presented a very curious appearance from the trusses of a liana hanging from their bows and resembling bundles of hay. If the eye was turned from the world of foliage above to the ground beneath it was attracted by the extreme elegance of the leaves of the ferns in Momose. The ladder, in some parts, covered the surface with a brushwood only a few inches high. In walking across these thick beds of Momose a broad track was marked by the change of shade produced by the drooping of their sensitive petioles. It is easy to specify the individual objects of admiration in these grand scenes, but it is not possible to give an adequate idea of the higher feelings of wonder, astonishment, and devotion which fill and elevate the mind. April 19. Leaving Sausagele during the two first days we retraced our steps. It was very wearisome work, as the road generally ran across a glaring hot sandy plain, not far from the coast. I noticed that each time the horse put its foot on the fine salacious sand a gentle chirping noise was produced. On the third day we took a different line and passed through the gay little village of Madre Gideos. This is one of the principal lines of road in Brazil, yet it was in so bad a state that no wheeled vehicle, accepting the clumsy bullock wagon, could pass along. In our whole journey we did not cross a single bridge built of stone, and those made of logs of wood were frequently so much out of repair that it was necessary to go on one side to avoid them. All distances are inaccurately known. The road is often marked by crosses in the place of milestones to signify where human blood has been spilled. On the evening of the twenty-third we arrived at Rio, having finished our pleasant little excursion. During the remainder of my stay at Rio I resided in a cottage at Bota Fogo Bay. It was impossible to wish for anything more delightful than thus to spend some weeks in so magnificent a country. In England any person fond of natural history enjoys in his walks a great advantage by always having something to attract his attention, but in these fertile climates teeming with life the attractions are so numerous that he is scarcely able to walk at all. The few observations which I was unable to make were almost exclusively confined to the invertebrate animals. The existence of a division of the genus Plenaria, which inhabits the dry land, interested me much. These animals are of so simple a structure that Cuvier has arranged them with the intestinal worms, though never found within the bodies of other animals. Numerous species inhabit both salt and fresh water, but those to which I elude were found, even in the drier parts of the forest, beneath logs of rotten wood, on which I believe they feed. In general form they resemble little slugs, but they are very much narrower in proportion, and several of the species are beautifully colored with longitudinal stripes. Their structure is very simple. Near the middle of the under, or crawling surface, there are two small transverse slits, from the anterior one of which a funnel-shaped and highly irritable mouth can be protruded. For some time after the rest of the animal was completely dead from the effects of salt water or any other cause, this organ still retained its vitality. I found no less than twelve different species of terrestrial plenariae in different parts of the southern hemisphere. I have described and named these species in the Annals of Natural History, volume 14, page 241. Some species, which I obtained at Van Diemen's Land, I kept alive for nearly two months, feeding them on rotten wood. Then cut one of them transversely into two nearly equal parts. In the course of a fortnight both had the shape of perfect animals. I had, however, so divided the body that one of the haves contained both the inferior orifices, and the other, in consequence, none. In the course of twenty-five days from the operation the more perfect half could not have been distinguished from any other specimen. The other had increased much in size, and toward its posterior end a clear space was formed in the Parenchymatus mass, in which a rudimentary cup-shaped mouth could clearly be distinguished. On the undersurface, however, no corresponding slit was yet open. If the increased heat of the weather, as we approach the equator, had not destroyed all the individuals, there can be no doubt that this last step would have completed its structure. Although so well known an experiment, it was interesting to watch the gradual production of every essential organ out of the simple extremity of another animal. It is extremely difficult to preserve these planariés. As soon as the cessation of life allows the ordinary laws of change to act, their entire bodies become soft and fluid, with a rapidity which I have never seen equaled. I first visited the forest in which these planariés were found, in company with an old Portuguese priest who took me out to hunt with him. The sport consisted in turning into the cover of few dogs, and then patiently waiting to fire any animal which might appear. We were accompanied by the son of a neighbouring farmer, a good specimen of a wild Brazilian youth. He was dressed in a tattered old shirt and trousers, and had his head uncovered. He carried an old-fashioned gun and a large knife. The habit of carrying the knife is universal, and in traversing the thick wood it is almost necessary, on account of the creeping plants. The frequent occurrence of murder may be partly attributed to this habit. The Brazilians are so dexterous with the knife that they can throw it to some distance with precision, and with sufficient force to cause a fatal wound. I have seen a number of little boys practicing this art as a game of play, and from their skill in hitting an upright stick they promised well for more earnest attempts. My companion the day before had shot two large-bearded monkeys. These animals have prehensile tails, the extremity of which, even after death, can support the whole weight of the body. One of them thus remained fast to a branch, and it was necessary to cut down a large tree to procure it. This was soon affected, and down came tree and monkey with an awful crash. Our day sport, besides the monkey, was confined to sundry small green parrots and a few toucans. I profited, however, by my acquaintance with the Portuguese Padre. For on another occasion he gave me a fine specimen of the Jaguarundi cat. End of Chapter 2, Part 1. Recording by Scott Robbins. Chapter 2, Part 2 of The Voyage of the Beagle. This is a livervox recording. All livervox recordings are in the public domain. For more information, or to volunteer, please visit Librevox.org The Voyage of the Beagle, by Charles Darwin. Chapter 2, Part 2, Rio de Janeiro. Everyone has heard of the beauty of the scenery near both the Fogel. The house in which I lived was seated close beneath the well-known mountain of the Corcovado. It has been remarked with much truth that abruptly conical hills are characteristic of the formation which Humboldt designates as nice granite. Nothing can be more striking than the effect of these huge rounded masses of naked rock rising out of the most luxuriant vegetation. I was often interested by watching the clouds, which rolled in from seaward, formed a bank just below the highest point of the Corcovado. This mountain, like most others, when thus partly veiled, appeared to rise to a far prouder elevation than its real height of 2300 feet. Mr. Daniel has observed, in his meteorological essays, that a cloud sometimes appears fixed on a mountain summit while the wind continues to blow over it. The same phenomenon here presented a slightly different appearance. In this case the cloud was clearly seen to curl over and rapidly pass by the summit, and yet was neither diminished nor increased in size. The sun was setting and a gentle southerly breeze, striking against the southern side of the rock, mingled its current with the colder air above, and the vapor was thus condensed. But as the light wreaths of cloud passed over the ridge and came within the influence of the warmer atmosphere of the northern sloping bank, they were immediately re-dissolved. The climate during the months of May and June, or the beginning of winter, was delightful. The mean temperature from observations taken at nine o'clock both morning and evening was only seventy-two degrees. It often rained heavily, but the dry and southerly winds soon again rendered the walks pleasant. One morning, in the course of six hours, one point six inches of rain fell. As this storm passed over the forest which surround the corcovado, the sound produced by the drops pattering on the countless multitude of leaves was very remarkable. It could be heard at the distance of a quarter of a mile, and was like the rushing of a great body of water. After the hotter days it was delicious to sit quietly in the garden and watch the evening pass into night. Nature in these climbs chooses her vocalists from more humble performers than in Europe. A small frog of the genus Hila sits on a blade of grass, about an inch above the surface of the water, and sends forth a pleasing chirp. When several are together they sing in harmony on different notes. I had some difficulty in catching a specimen of this frog. The genus Hila has its toes terminated by small suckers, and I found this animal could crawl up a pane of glass when placed absolutely perpendicular. Most sick day and crickets at the same time keep up a ceaseless shrill cry, but which, softened by the distance, is not unpleasant. Every evening after dark this great concert commenced, and often have I sat listening to it, until my attention has been drawn away by some curious passing insect. At these times the fireflies are seen flitting about from hedge to hedge. On a dark night the light can be seen at about two hundred paces distant. It is remarkable that in all the different kinds of glowworms, shining elators, and various marine mammals, such as the crustacea, medusae, nareidae, and corlein of the genus Cletia and pyrosma, which I have observed, the light has been of a well marked green color. All the fireflies which I caught here belong to the Lempira day, in which family the English glowworm is included, and the greater number of specimens were of Lempira's Occidentalis. I am greatly indebted to Mr. Waterhouse for his kindness in naming for me this and many other insects, and giving me much valuable assistance. I found that this insect emitted the most brilliant flashes when irritated. In the intervals the abdominal rings were obscured. The flash was almost co-instantaneous in the two rings, but it was just perceptible first in the anterior one. The shining matter was fluid and very adhesive. Little spots where the skin had been torn continued bright with a slight scintillation whilst the uninjured parts were obscured. When the insect was decapitated the rings remained uninterruptedly bright, but not so brilliant as before. The little irritation with the needle always increased the vividness of the light. The rings in one instance retained their luminous property nearly twenty-four hours after the death of the insect. From these facts it would appear probable that the animal has only the power of concealing or extinguishing the light for short intervals, and that at other times the display is involuntary. On the muddy and wet gravel walks I found the larvae of this Lempiras in great numbers. They resembled in general form the female of the English glowworm. These larvae possessed but feeble luminous powers, very differently from their parents. On the slightest touch they faint death and cease to shine, nor did irritation excite any fresh display. I kept several of them alive for some time. Their tails are very singular organs, for they act by a well-fitted contrivance as suckers or organs of attachment, and likewise as reservoirs for saliva or some such fluid. I repeatedly fed them on raw meat, and I invariably observed that every now and then the extremity of the tail was applied to the mouth, and a drop of fluid exuded on the meat, which was then in the act of being consumed. The tail, notwithstanding so much practice, does not seem to be able to find its way to the mouth. At least the neck was always touched first, and apparently as a guide. When we were at Baia, and a later, or beetle, Pyrophorus luminosis, seemed the most common luminous insect. The light in this case was also rendered more brilliant by irritation. I amused myself one day by observing the springing powers of this insect, which have not, it appears to me, been properly described. In Kirby's Entomology, Volume 2, Page 317, the elator, when placed on its back and preparing to spring, moved its head and thorax backwards, so that the pectoral spine was drawn out and rested on the edge of its sheath. The same backward movement being continued, the spine, by the full action of the muscles, was bent like a spring, and the insect at this moment rested on the extremity of its head and wing cases. The effort being suddenly relaxed, the head and thorax flew up, and in consequence the base of the wing cases struck the supporting surface with such force that the insect by the reaction was jerked upwards to the height of one or two inches. The projecting points of the thorax and the sheath of the spine served to steady the whole body during the spring. In the descriptions which I have read, sufficient stress does not appear to have been laid on the elasticity of the spine, so sudden a spring could not be the result of simple muscular contraction, without the aid of some mechanical contrivance. On several occasions I enjoyed some short but most pleasant excursions in the neighbouring country. One day I went to the Botanic Garden, where many plants, well known for their great utility, might be seen growing. The leaves of the camphor, pepper, cinnamon, and clove trees were delightfully aromatic, and the breadfruit, the zhaka, and the mango vied with each other in the magnificence of their foliage. The landscape in the neighbourhood of Bayia almost takes its character from the two latter trees. Before seeing them I had no idea that any trees could cast so black a shade on the ground. Both of them bear to the evergreen vegetation of these climates the same kind of relation which laurels and hullies in England due to the lighter green of the deciduous trees. It may be observed that the houses within the tropics are surrounded by the most beautiful forms of vegetation, because many of them are at the same time most useful to man. Who can doubt that these qualities are united at the banana, the coconut, the many kinds of palm, the orange, and the breadfruit tree? During this day I was particularly struck with the remark of Humboldts, who often alludes to the thin vapour which without changing the transparency of the air renders its tints more harmonious and softens its effects. This is an appearance which I have never observed in the temperate zones. The atmosphere, seen through a short space of half or three quarters of a mile, was perfectly lucid, but at a greater distance all colours were blended into a most beautiful haze of a pale French grey mangled with a little blue. The condition of the atmosphere between the morning and about noon, when the effect was most evident, had undergone little change excepting in its dryness. In the interval the difference between the dew point and temperature had increased from 7.5 to 17 degrees. On another occasion I started early and walked to the Gavia, or Top Sail Mountain. The air was delightfully cool and fragrant, and the dops of dew still glittered on the leaves of the large liliaceous plants, which shaded the streamlets of clear water. Sitting down on a block of granite, it was delightful to watch the various insects and birds as they flew past. The hummingbird seems particularly fond of such shady retired spots. Whenever I saw these little creatures buzzing round a flower with their wings vibrating so rapidly as to be scarcely visible, I was reminded of the Sphinx mods. Their movements and habits are indeed in many respects, very similar. Following a pathway I entered a noble forest, and from a height of five or six hundred feet one of those splendid views was presented, which are so common on every side of Rio. At this elevation the landscape attains its most brilliant tint, and every form, every shade, so completely surpasses in magnificence all that the European has ever beheld in his own country that he knows not how to express his feelings. The general effect frequently recalled to my mind the gayest scenery of the opera house, or the great theaters. I never returned from these excursions empty-handed. This day I found a specimen of a curious fungus called Hymenophilus. Most people know the English phallus, which in autumn taints the air with its odious smell. This however, as the entomologist is aware, is to some of our beetles a delightful fragrance. So it was here, for a strongulus attracted by the odor alighted on the fungus as I carried it in my hand. We here see in two distant countries a similar relation between plants and insects of the same families, though the species of both are different. When man is the agent in introducing into a country a new species, this relation is often broken. As one instance of this I may mention that the leaves of the cabbages and lettuces, which in English afford food to such a multitude of slugs and caterpillars, in the gardens near Rio, are untouched. During our stay at Brazil I made a large collection of insects. A few general observations on the comparative importance of the different orders may be interesting to the English entomologist. The large and brilliantly colored Lepidoptera bespeak the zone they inhabit, far more plainly than any other race of animals. I allude only to the butterflies, for the moths, contrary to what may have been expected from the rankness of the vegetation, certainly appeared in much fewer numbers than in our own temperate regions. I was much surprised at the habits of papilloforonia. This butterfly is not uncommon and generally frequents the orange groves, although a high flyer, yet it very frequently alights on the trunks of trees. On these occasions its head is invariably placed downwards and its wings are expanded in a horizontal plane instead of being folded vertically, as is commonly the case. This is the only butterfly which I have ever seen that uses its legs for running. Not being aware of this fact, the insect more than once, as I cautiously approached with my forceps, shuffled on one side just as the instrument was on the point of closing, and thus escaped. But a far more singular fact is the power which this species possesses of making a noise. Mr. Doubleday has lately described, before the entomological society, March 3, 1845, a peculiar structure in the wings of this butterfly, which seems to be the means of its making its noise. He says, It is remarkable for having a sort of drum at the base of the four wings, between the costal nerveur and the sub-costal. These two nerveurs, moreover, have a peculiar screw-like diaphragm or vessel in the interior. I find in Langsdorff's travels, in the years 1803 to 1807, page 74, it is said that in the island of St. Catherine's on the coast of Brazil, a butterfly called Februa Hoffman-Seggy makes a noise when flying away like a rattle. Several times, when a pair, probably male and female, were chasing each other in an irregular course, they passed within a few yards of me, and I distinctly heard a clicking noise, similar to that produced by a toothed wheel passing under a spring-catch. The noise was continued at short intervals, and could be distinguished at about twenty yards' distance. I am certain there is no error in the observation. I was disappointed in the general aspect of the coloreptorah. The number of minute and obscurely colored beetles is exceedingly great. I may mention, as a common instance of one day's, June 23rd, collecting, when I was not attending particularly to the coloreptorah, that I caught sixty-eight species of that order. Among these there were only two of the carabide, four brachylitra, fifteen rancophora, and fourteen of the chrysumelidae. Thirty-seven species of arachnidae, which I brought home, will be sufficient to prove that I was not paying over much attention to the generally favored order of coloreptorah. The cabinets of Europe can, as yet, boast only of the larger species from tropical climates. It is sufficient to disturb the composure of an entomologist mind to look forward to the future dimensions of a complete catalogue. The carnivorous beetles, or carabide, appear in extremely few numbers within the tropics. This is more remarkable when compared to the case of the carnivorous quadrupeds, which are so abundant in hot countries. I was struck with this observation, both on entering Brazil, and when I saw the many elegant and active forms of the harpalidae reappearing on the temperate plains of La Plata. Do the very numerous spiders and rapacious hymenopteros supply the pace of the carnivorous beetles? The carrion feeders and brachylitra are very uncommon. On the other hand, the rankofora and chrysomelidae, all of which depend on the vegetable world for subsistence, are present in astonishing numbers. I do not here refer to the number of different species, but to that of the individual insects, for on this it is the most striking character in the entomology of different countries depends. The orders orthoptera and hemiptera are particularly numerous, as likewise is the stinging division of the hymenoptera, the bees perhaps being accepted. A person on first entering a tropical forest is astonished at the labours of the ants, well-beaten paths branch off in every direction, on which an army of never-failing foragers may be seen, some going forth and others returning, burdened with pieces of green leaf, often larger than their own bodies. A small dark-coloured ant sometimes migrates in countless numbers. One day at Baia, my attention was drawn by observing many spiders, cockroaches, and other insects, and some lizards rushing in the greatest agitation across a bare piece of ground.  The swarm, having crossed the bare space, divided itself and descended an old wall. By this means many insects were fairly enclosed, and the efforts which the poor little creatures made to extricate themselves from such a depth were wonderful. When the ants came to the road, they changed their course, and in narrow files re-ascended the wall. Having placed a small stone so as to intercept one of the lines, the whole body attacked it, and then immediately retired. Shortly afterwards another body came to the charge, and again having failed to make any impression, this line of march was entirely given up. By going an inch round, the file might have avoided the stone, and this doubtless would have happened if it had been originally there, but having been attacked, the line-hearted little warriors scorned the idea of yielding. Certain wasp-like insects, which construct in the corners of the verandah's clay cells for their larvae, are very numerous in the neighborhood of Rio. These cells they stuff full of half-dead spiders and caterpillars, which they seem wonderfully to know how distinct to that degree as to leave them paralyzed but alive until their eggs are hatched, and the larvae feed on the horrid mass of powerless, half-killed victims, a site which has been described by an enthusiastic naturalist as curious and pleasing. In a M.S. in the British Museum by Mr. Abbott, who made his observations in Georgia, C. Mr. A. White's paper in the Annals of Natural History, volume 7, page 472. Lieutenant Huntin has described as fex with similar habits in India in the Journal of the Asiatic Society, volume 1, page 555. I was much interested one day by watching a deadly contest between a pepsis and a large spider of the genus Lycosa. The wasp made a sudden dash at its prey, and then flew away. The spider was evidently wounded, for, trying to escape, it rolled down a little slope, but had still strength sufficient to crawl into a thick tuft of grass. The wasp soon returned, and seemed surprised at not immediately finding its victim. It then commenced as regular a hunt as everhound did after fox, making short semicircular casts, all the time rapidly vibrating its wings in antennae. The spider, though well concealed, was soon discovered, and the wasp evidently still afraid of its adversaries' jaws after much maneuvering inflicted two stings on the underside of its thorax. At last, carefully examining with its antennae the now motionless spider, it proceeded to drag away the body, but I stopped both tyrant and prey. Don Felix Azara, volume one, page 175, mentioning the hymenopterous insect, probably of the same genus, says he saw it dragging a dead spider through tall grass in a straight line to its nest, which was 163 paces distant. He adds that the wasp, in order to find the road, every now and then, made demitule d'environment trois paves. The number of spiders in proportion to other insects is here compared with England very much larger, perhaps more so than with any other division of the articulate animals. The variety of species among the jumping spiders appears almost infinite. The genus, or rather family, of a para, is here characterized by many singular forms. Some species have pointed koreaceous shells, others enlarged and spiny tibiae. Every path in the forest is barricaded with the strong yellow web of a species, belonging to the same division with the apera clavipes of Fabricius, which was formerly said by Sloan to make in the West Indies, webs so strong as to catch birds. A small and pretty kind of spider, with very long forelegs in which appears to belong to an undescribed genus, lives as a parasite on almost every one of these webs. I suppose it is too insignificant to be noticed by the great apera, and is therefore allowed to prey on the minute insects, which, adhering to the lines, would otherwise be wasted. When frightened, this little spider either feigns death by extending its front legs, or suddenly drops from the web. A large apera of the same division with the para tuberculata and conica is extremely common, especially in dry situations. Its web, which is generally placed among the great leaves of the common agave, is sometimes strengthened near the center by a pair or even four zigzag ribbons, which connect to a joining rays. When any large insect, as a grasshopper or wasp is caught, the spider, by a dexterous movement, makes it revolve very rapidly, and at the same time emitting a band of threads from its spinners, soon envelops its prey in a case like the cocoon of a silkworm. The spider now examines the powerless victim and gives the fatal bite on the hindered part of its thorax. Then retreating patiently waits till the poison has taken effect. The virulence of this poison may be judged of from the fact that in half a minute I opened the mesh and found a large wasp quite lifeless. This apera always stands with its head downwards near the center of the web. When disturbed, it acts differently according to circumstances. If there is a thicket below, it suddenly falls down, and I have distinctly seen the thread from the spinners lengthened by the animal while yet stationary as preparatory to its fall. If the ground is clear beneath, the apera seldom falls but moves quickly through a central passage, from one to the other side. When still further disturbed, it practices a most curious maneuver. Standing in the middle, it violently jerks the web, which it attached to elastic twigs, till at last the hole acquires such a rapid vibratory movement that even the outline of the spider's body becomes indistinct. It is well known that most of the British spiders, when a large insect is caught in their webs, endeavor to cut the lions and liberate their prey to save their nets from being entirely spoiled. I once, however, saw in a hot house in Shropshire a large female wasp caught in the irregular web of a quite small spider. In this spider, instead of cutting the web, most perseveringly continued to untangle the body and especially the wings of its prey. The wasp at first aimed in vain repeated thrust with its sting at its little antagonist. Pitting the wasp after allowing it to struggle for more than an hour, I killed it and put it back into the web. The spider soon returned, and an hour afterwards I was much surprised to find it with its jaws buried in the orifice through which the sting is protruded by the living wasp. I drove the spider away two or three times, but for the next 24 hours I always found it again sucking at the same place. The spider became much distended by the juices of its prey, which was many times larger than itself.  The webs were placed vertically, as is invariably the case with the genus Apera. They were separated from each other by a space of about two feet, but were all attached to certain common lines, which were of great length and extended to all parts of the community. In this manner the tops of some large bushes were encompassed by the United Nets. Azara in Azara's Voyage. Azara in Azara's Voyage, volume 1, page 213, has described a gregarious spider in Paraguay, which, welcome to here, thinks must be a Theridagon, but probably it is an Apera, and perhaps even the same species with mine. I cannot, however, recollect seen a central nest as large as a hat, in which, during autumn, when the spiders die, Azara says the eggs are deposited. As all the spiders which I saw were of the same size, they must have been nearly of the same age. This gregarious habit, in so typical a genus as Apera, among insects which are so bloodthirsty and solitary, that even the two sexes attack each other, is a very singular fact. In a lofty valley of the Cordillera near Mendoza, I found another spider with a singularly formed web. Strong lines radiated in a vertical plane from a common center, where the insect had its station, but only two of the rays were connected by symmetrical meshwork, so that the net, instead of being as is generally the case circular, consisted of a wedge-shaped segment. All the webs were similarly constructed. End of Chapter 2, Part 2, Recording by Scott Robbins.