from the moment that the form of his body became stationary, his mind would become subject to those very influences from which his body had escaped; every slight variation in his mental and moral nature which should enable him better to guard against adverse circumstances, and combine for mutual comfort and protection would be preserved and accumulated; the better and higher specimens of our race would therefore increase and spread, the lower and more brutal would give way and successively die out, and that rapid advancement of mental organization would occur which has raised the very lowest races of man so far above the brutes (although differing so little from some of them in physical structure) and, in conjunction with scarcely perceptible modifications of form, has developed the wonderful intellect of the European races." "When the power that had hitherto modified the body had its action transferred to the mind, then races would advance and become improved, merely by the harsh discipline of a sterile soil and inclement seasons; under their influence a hardier, a more provident, and a more social race would be developed." And especially: "If my conclusions are just, it must inevitably follow that the higher--the more intellectual and moral--must displace the lower and more degraded races; and the power of natural selection, still acting on his mental organization, must ever lead to a more perfect adaptation of man's higher faculties to the conditions of surrounding nature and to the exigencies of the social state. While his external form will probably ever remain unchanged, except in the development of that perfect beauty which results from a healthy and well-organized body, refined and ennobled by the highest intellectual faculties and sympathetic emotions, his mental constitution may advance and improve, till the world is again inhabited by a single nearly homogeneous race, no individual of which will be inferior to the noblest specimens of existing humanity. "Our progress towards such a result is very slow, but it still seems to be a progress."