I was barely aware of the changing gray outlines of the city: I stared, praying for the fleeting glimpse of a spectral cage.... I think that up to 3,000 A.D., New York remained much the same. And then, quite suddenly, in some vast storm or cataclysm, it was gone. I saw but a blurred chaos. This was near 4,000 A.D. Then it was rebuilt, smaller, with more trees growing about, until presently there seemed only a forest. People, if they still were here, were building such transitory structures that I could not see them. * * * * * 5,000 A.D. Mankind no doubt had reached its peak of civilization, paused at the summit and now was in decadence, reverting to savagery. Perhaps in Europe the civilized peak lasted longer. This was a backward space during the ascent; perhaps now it was reverting faster to the primitive. But I think that by 15,000 A.D., mankind over all the Earth had become primitive. There is no standing still: we must go forward; or back. Man, with his own machines softening him, enabling him to do nothing, eventually unfitted himself to cope with nature. That storm at 4,000 A.D. in New York, for instance, even in my own Time would have been merely an incentive to reconstruct upon a greater scale. But the men of 4,000 A.D. could not do that.... At the year 10,000 A.D., with a seemingly primeval forest around us, Tina, Larry and I held an anxious consultation. We had anticipated that Tugh would stop in his own Time-world. That might have been around 3,000 or 4,000; but we hardly thought, as we viewed the scene in passing, that he had come originally from beyond 4,000. He was too civilized. Tugh had not stopped. He had to be still ahead of us, so our course was to follow. Whenever he stopped, we would see him. If he turned back and flashed past us, that too would be evident. But if, from 2,930, he had gone into the past--! * * * * * And then suddenly we glimpsed the other cage! It was ahead of us, traveling more slowly and retarding as though about to stop. A gray unbroken forest was here. The time was about 12,000 A.D. Tina saw it first through the little telescopic-barrel; then it showed on the mirror-grid--a faint, ghostly-barred shape, thin as gossamer. We even saw it presently through the window. It held its steady position, level with us, hanging solid amid the melting, changing gray outlines of the forest trees. They blurred it as they rose and fell. This chase through Time! The two cages sped forward with the gray panorama whirling around them. Of all the scene, only that other cage, to us, was real. Yet it was the cages which were apparitions. We gathered at our eastward window to gaze across the void of that five hundred feet. The interior of Tugh's cage was not visible to us. A little window--a thinner patch in the lattices of the cage-side--fronted us; but nothing showed in it.