We withdrew from the brink, and I meditated in silence. Then I crept again to the edge of the bluff, and lying flat on my chest, craned my head over, and peered down into the luminous gulf. The texture of the receding mineral was distinctly visible for a considerable distance, and then far, far beneath all semblance to material form disappeared--as the hull of a vessel fades in deep, clear water. As I gazed into the gulf it seemed evident that, as a board floating in water is bounded by water, this rock really ended. I turned to my guide and questioned him. "Stone in this situation is as cork," he replied; "it is nearly devoid of weight; your surmise is correct. We stand on the shelving edge of a cliff of earthly matter, that in this spot slants upward from beneath like the bow of a boat. We have reached the bottom of the film of space dust on the bubble of energy that forms the skeleton of earth." I clutched the edge of the cliff with both hands. "Be not frightened; have I not told you that if you wish to return you can do so. Now hearken to me: "A short time ago you endeavored to convince me that we could not descend from this precipice, and you are aware that your arguments were without foundation. You drew upon your knowledge of earth materials, as you once learned them, and realized at the time that you deluded yourself in doing so, for you know that present conditions are not such as exist above ground. You are now influenced by surroundings that are entirely different from those that govern the lives of men upon the earth's surface. You are almost without weight. You have nearly ceased to breathe, as long since you discovered, and soon I hope will agree entirely to suspend that harsh and wearying movement. Your heart scarcely pulsates, and if you go with me farther in this journey, will soon cease to beat." I started up and turned to flee, but he grasped and held me firmly. "Would you murder me? Do you think I will mutely acquiesce, while you coolly inform me of your inhuman intent, and gloat over the fact that my heart will soon be as stone, and that I will be a corpse?" He attempted to break in, but I proceeded in frenzy. "I _will_ return to upper earth, to sunshine and humanity. I _will_ retreat while yet in health and strength, and although I have in apparent willingness accompanied you to this point, learn now that at all times I have been possessed of the means to defend myself from personal violence." I drew from my pocket the bar of iron. "See, this I secreted about my person in the fresh air of upper earth, the sweet sunshine of heaven, fearing that I might fall into the hands of men with whom I must combat. Back, back," I cried. He released his hold of my person, and folded his arms upon his breast, then quietly faced me, standing directly between myself and the passage we had trod, while I stood on the brink, my back to that fearful chasm.