"Come, this is more than I bargained for," exclaimed Uncle Denis; "now stand by for a different kind of sound. Don't be alarmed, it's only the barrel of my pistol going to try what sort of noise it can make." He pulled the trigger, when there was a flash and then there came a succession of crashing, thundering sounds echoed from every angle in those enormous vaults. Backwards and forwards tore the sounds, rolling and reverberating from wall to wall with terrific crashes. Half a dozen pieces of artillery fired in the open air could not have produced a more tremendous uproar. Scarcely had the sounds died away, when Peter and Caesar struck up a merry negro melody, contrasting curiously with the melancholy notes of the Indian's song; they made Uncle Denis and me, at all events, burst in to hearty fits of laughter. "Come, I like that style of song far better than the music of our red-skin friend," exclaimed my uncle. The guide told us that although it was perfectly safe at most times of the year to traverse the cavern, there were occasions when the waters rising suddenly had prevented the return of explorers, but that a way had been discovered, through a narrow passage, the course evidently at one time of a stream, up which they could climb over the mud and save themselves from being either drowned or starved, should they have come without provisions. This passage has appropriately been called "Purgatory," but as we had not to take advantage of it, I cannot describe it more fully. Leaving "Echo" River we entered another cavern named "Cleveland's Cabinet," when we found ourselves in what we might have taken for a fairy region. Above our heads and on either side, the roof and walls were adorned with delicate flowers of snowy whiteness, and domes, and turrets, and spires, and shrubs, and trees, as well as the forms of birds and beasts of all descriptions; elephants and camels, eagles and turkeys and doves; indeed figures of every shape which imagination without any great exertion might please to picture. The representations of some indeed were so perfect that it was difficult to believe that they had not been carved by the hand of man, and yet one and all were produced by the dripping of water from the gypsum rock; the most delicate ice formations could not surpass them; indeed many equalled in form the choicest flowers growing in the most cultivated garden. As we proceeded on, we found that the cavern was not destitute of inhabitants. Huge crickets and spiders, almost of a white colour, crawled over the ground, the former not taking jumps, but moving steadily forward with their long legs. Rats too, Uncle Denis declared they were as big as leverets, ran by us, exhibiting their sharp teeth and extensive tails. When no other provisions are to be obtained, they live apparently on the spiders and crickets.