Presently a white object appeared ahead; and on coming to it, he found it was a wall, white as snow, with some kind of crystal. He touched it, when the wall fell immediately, with a crushing sound as if pulverised, and disappeared in a vast cavern at his feet. Beyond this chasm he came to more walls like those of houses, such as would be left if the roofs fell in. He carefully avoided touching them, for they seemed as brittle as glass, and merely a white powder having no consistency at all. As he advanced these remnants of buildings increased in number, so that he had to wind in and out round them. In some places the crystallized wall had fallen of itself, and he could see down into the cavern; for the house had either been built partly underground, or, which was more probable, the ground had risen. Whether the walls had been of bricks or stone or other material he could not tell; they were now like salt. Soon wearying of winding round these walls, Felix returned and retraced his steps till he was outside the place, and then went on towards the left. Not long after, as he still walked in a dream and without feeling his feet, he descended a slight slope and found the ground change in colour from black to a dull red. In his dazed state he had taken several steps into this red before he noticed that it was liquid, unctuous and slimy, like a thick oil. It deepened rapidly and was already over his shoes; he returned to the black shore and stood looking out over the water, if such it could be called. The luminous yellow vapour had now risen a height of ten or fifteen feet, and formed a roof both over the land and over the red water, under which it was possible to see for a great distance. The surface of the red oil or viscid liquid was perfectly smooth, and, indeed, it did not seem as if any wind could rouse a wave on it, much less that a swell should be left after the gale had gone down. Disappointed in his search for water to drink, Felix mechanically turned to go back. He followed his luminous footmarks, which he could see a long way before him. His trail curved so much that he made many short cuts across the winding line he had left. His weariness was now so intense that all feeling had departed. His feet, his limbs, his arms, and hands were numbed. The subtle poison of the emanations from the earth had begun to deaden his nerves. It seemed a full hour or more to him till he reached the spot where the skeletons were drawn in white upon the ground.