The theory of evolution has taught

The theory of evolution has taught us in science to thinkin larger terms of time, so that we no longer raise the question whether European colonists in Africa can turn into ne-groes, though we do find the recent amazing statement thatthe Yankee, in his tall, gaunt figure, "the colour of his skin,and the formation of his hair, has begun to differentiate him-self from his European kinsman and approach the type of theaboriginal Indians.” Evolution tells the story of modification by a succession of infinitesimal changes, and emphasizesthe permanence of a modification once produced long afterthe causes for it cease to act The mesas of Arizona, theearth sculpture of the Grand Canyon remain as monuments tothe erosive forces which produced them. So a habitat leavesupon man no ephemeral impress; it affects him in one way ata low stage of his development, and differently at a later orhigher stage, because the man himself and his relation to hisenvironment have been modified in the earlier period; buttraces of that earlier adaptation survive in his maturer life.