eight o'clock
Towards six o'clock , this festival of light began sensibly and visibly to decrease , and soon almost ceased . The sides of the gallery assumed a crystallized tint , with a somber hue ; white mica began to commingle more freely with feldspar and quartz , to form what may be called the true rock -- the stone which is hard above all , that supports , without being crushed , the four stories of the earth 's soil . We were walled by an immense prison of granite ! It was now eight o'clock , and still there was no sign of water . The sufferings I endured were horrible . My uncle now kept at the head of our little column . Nothing could induce him to stop .