After a time I returned to a place near the ruined city by the two rivers; and in the rocky palisades above one of the streams, I made out some small circular holes barely large enough to admit a man. And, borne onward by some impulse of curiosity and despair, I entered one of these holes, and went downward, far downward into the dim recesses. And now for the first time, at a depth of hundreds of yards, I did at last encounter living men. My first thought was that I had gone back to the day of the cave-man, for a cave-like hollow had been scooped out in the solid rock. It was true that the few hundreds of people huddled together there had the dress and looks of moderns; it was true, also, that the gloom was lighted for them by electric bulbs, and that electric radiators kept them warm; yet Dante himself, in painting the ninth circle of his Inferno, could not have imagined a drearier and more despondent group than these that slouched and drooped and muttered in that cavernous recess, seated with their heads fallen low upon their knees, or moodily pacing back and forth like captives who can hope for no escape. "Here at least we will be safe from the sky marauders," I heard one of them muttering. Yet I could not help wondering what the mere safety of the body could mean when all the glories of man's civilization were annihilated. II There came a whirring in my head, and another blank interval; and when I regained my senses I knew that another period of time had passed, possibly months or even years. I stood on the palisade above the river, near the entrance of the caves; and the sun was bright above me; but there was no brightness in the men and women that trailed out of a small circular hole in the ground. Drab as dock-rats, and pasty pale of countenance as hospital inmates, and with bent backs and dirty, tattered clothes and a mouse-like nosing manner, they emerged with the wariness of hunted refugees; and they flung up their hands with low cries to shield them from the brilliance of the sun, to which they were evidently unaccustomed. From the packs on their backs and the bundles in their hands, I knew that they were emerging from their subterranean refuge, to try to begin a new life in the ravaged world above; and my heart went out to them, for I saw that, few as they were--not more than fifty in all--they were the sole survivors of a once-populous region, and would have a bitter fight to wage in the man-made wilderness that had been a world metropolis.