We now flew rapidly away over rough and interminable ranges of mountains. Pure chaotic masses of stone, without a trace of vegetation in sight. Indeed there was no soil to support tree, bush, or herbage. We crossed frightful chasms, hundreds of feet deep, we scaled terrific heights, and looked down from the top of precipices into darkened valleys. Crags were heaped upon crags. Dreadful gorges yawned beneath us. Nothing in our own world can compare with this region, and when it is remembered that not a drop of water, or shovelful of soil is to be found, the terror of the place may be faintly pictured. At intervals we caught sight of those gigantic birds, which resembled the fabled roc, and which were apparently hatched in these desolations, for they were at home here where no other creature could support life, and what they found to live upon it was impossible to guess. They came swooping up from out the black chasms beneath, and after circling about us in curiosity, would descend again into the awful gulches from which they sprang. We were days in crossing these rugged ranges, which we called "the mountains of death," and we feel sure that the distance across them was more than a thousand miles. The heat throughout was intense, although nowhere did it compare with what we had already experienced. Torrence told me that one of those gigantic birds had come to his aid with water, just as it had to me, and the remains of his cask and mine furnished all our drink until we reached the Crystal River, a stream we found and named from its clearness; but this was not until we had put "the mountains of death" entirely behind us. The strange castellated structure upon which I had fallen was the only human habitation we discovered throughout our passage across these rugged ranges, and it remains a mystery to both of us where the inhabitants procured their food supplies, or even the water they drank and furnished to others. How that extraordinary edifice was ever constructed, or how its inmates communicated with the world beyond is likely to remain an unsolved mystery to the end of time. The air ship had behaved beautifully after leaving the "castle of the dead hills," as we called it, and Torrence told me that he had succeeded in making a perfect adjustment after getting the water, and that he believed the vibrator would not trouble us again. It was fortunate it had not, while crossing "the mountains of death," as there wore long stretches where it would have been difficult to have found enough level land for a resting place, and any misbehavior on the vessel’s part might have precipitated us into subterranean depths from which we could never have risen.