slow increments acquiring new capacity, while his body changed but little. When once he could strike fire, and chip a flint, and use a club, and strip off the bear's hide to cover himself, there was clearly no further use in thickening his own hide, or lengthening and sharpening his claws. Natural selection is the keenest capitalist in the universe; she never loses an instant in seizing the most profitable place for investment, and her judgment is never at fault. Forthwith, for a million years or more she invested all her capital in the psychical variations of this favoured primate, making little change in his body except so far as to aid in the general result, until by and by something like human intelligence of a low grade, like that of the Australian or the Andaman islander, was achieved. The genesis of humanity was by no means yet completed, but an enormous gulf had been crossed. After throwing out this luminous suggestion Mr. Wallace never followed it up as it admitted and deserved. It is too much to expect one man to do everything, and his splendid studies in the geographical distribution of organisms may well have left him little time for work in this direction. Who can fail to see that the selection of psychical variations, to the comparative neglect of physical variations, was the opening of a new and greater act in the drama of creation? Since that new departure the Creator's highest work has consisted not in bringing forth new types of body, but in expanding and perfecting the psychical attributes of the one creature in whose life those attributes have begun to acquire predominance. Along this human line of ascent there is no occasion for any further genesis of species, all future progress must continue to be not zoölogical, but psychological, organic evolution gives place to civilization. Thus in the long series of organic beings Man is the last; the cosmic process, having once evolved this masterpiece, could thenceforth do nothing better than to perfect him. [Illustration] VI _The Central Fact in the Genesis of Man_