ten o'clock
`` Oh , then , we may very easily find it hidden away somewhere among this thick brushwood , '' replied Jim . And sure enough , they found the rock , after an hour 's search , during which it had become almost dark , completely covered with a thick growth of tropical foliage . They were able to do nothing further that night , the light having completely gone by the time that the rock was finally identified ; so they camped out where they were , and began the search again the next morning . From the rock Jose now carefully paced off certain distances ; and , by ten o'clock in the forenoon he announced that he had discovered the spot where the treasure lay . At their feet ran a stream , the approach to which had been made by way of a gentle grassy slope . But the opposite side of the torrent was nothing more than a sheer wall of rock some hundreds of feet in height , and it seemed to Jim as though they had reached the uttermost confines of the world . They had come so far , but it was manifestly impossible to go any farther .