EXPLANATION
come of a long-continued underground habit. In the first place, there was the bleached look common in most animals that live largely in the dark—the white fish of the Kentucky caves, for instance. Then, those large eyes, with that capacity for reflecting light, are common features of nocturnal things—witness the owl and the cat. And last of all, that evident confusion in the sunshine, that hasty yet fumbling and awkward flight towards dark shadow, and that peculiar carriage of the head while in the light—all reinforced the theory of an extreme sensitiveness of the retina.
"Beneath my feet then the earth must be tunnelled enormously, and these tunnellings were the habitat of the New Race. The presence of ventilating-shafts and wells along the hill slopes—everywhere, in fact, except along the river valley—showed how universal were its ramifications. What so natural, then, as to assume that it was in this artificial Underworld that such work as was necessary to the comfort of the daylight race was done? The notion was so plausible that I at once accepted it, and went on to assume the how of this splitting of the human species. I dare say you will anticipate the shape of my theory, though, for myself, I very soon felt that it fell far short of the truth.
"At first, proceeding from the problems of our
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