here alone with it, what could I accomplish single-handed? Nothing. But where there was no east, no west, no north, no south, no stars, no moon, and only a stationary midday sun, how was I to find my way back to this spot should ever I get out of sight of it? I didn’t know. For a long time I stood buried in deep thought, when it occurred to me to try out one of the compasses I had brought and ascertain if it remained steadily fixed upon an unvarying pole. I reentered the prospector and fetched a compass without. Moving a considerable distance from the prospector that the needle might not be influenced by its great bulk of iron and steel I turned the delicate instrument about in every direction. Always and steadily the needle remained rigidly fixed upon a point straight out to sea, apparently pointing toward a large island some ten or twenty miles distant. This then should be north. I drew my note-book from my pocket and made a careful topographical sketch of the locality within the range of my vision. Due north lay the island, far out upon the shimmering sea. The spot I had chosen for my observations was the top of a large, flat boulder which rose six or eight feet above the turf. This spot I called Greenwich. The boulder was the “Royal Observatory.” I had made a start! I cannot tell you what a sense of relief was imparted to me by the simple fact that there was at least one spot within Pellucidar with a familiar name and a place upon a map. It was with almost childish joy that I made a little circle in my note-book and traced the word Greenwich beside it. Now I felt I might start out upon my search with some assurance of finding my way back again to the prospector. I decided that at first I would travel directly south in the hope that I might in that direction find some familiar landmark. It was as good a direction as any. This much at least might be said of it. Among the many other things I had brought from the outer world were a number of pedometers. I slipped three of these into my pockets with the idea that I might arrive at a more or less accurate mean from the registrations of them all.