(b) It is objected, moreover, that the diversities of size, color, and physical conformation, among the various families of mankind, are inconsistent with the theory of a common origin. But we reply that these diversities are of a superficial character, and can be accounted for by corresponding diversities of condition and environment. Changes, which have been observed and recorded within historic time, show that the differences alluded to, may be the result of slowly accumulated divergences from one and the same original and ancestral type. The difficulty in the case, moreover, is greatly relieved when we remember
(1) that the period dining which these divergences have arisen is by no means limited to six thousand years (see note on the antiquity of the race, pages 224-226).
(2) That, since species in general exhibit their greatest power of divergence into varieties immediately after their first introduction, all the varieties of the human species may have presented themselves in men?s earliest history.
Instances of physiological change as the result of new conditions: The Irish driven by the English two centuries ago from Armagh and the south of Down, have become prognathous like the Australians. The inhabitants of New England have descended from the English, yet they have already a physical type of their own. The Indians of North America, or at least certain tribes of them, have permanently altered the shape of the skull by bandaging the head in infancy. The Sikhs of India, since the establishment of B-ba N-nak?s religion (A.D.1500) and their consequent advance in civilization, have changed to a longer head and more regular features, so that they are now distinguished greatly from their neighbors, the Afghans, Tibetans, Hindus. The Ostiak Savages have become the Magyar nobility of Hungary. The Turks in Europe are, in cranial shape, greatly in advance of the Turks in Asia from whom they descended. The Jews are confessedly of one ancestry yet we have among them the light-haired Jews of Poland, the dark Jews of Spain and the Ethiopian Jews of the Nile Valley. The Portuguese who settled in the East Indies in the 16th century are now as dark in complexion as the Hindus themselves. Africans become lighter in complexion as they go up from the alluvial riverbanks to higher land, or from the coast and on the contrary the coast tribes which drive out the Negroes of the interior and take their territory end by becoming Negroes themselves. See, for many of the above facts, Burgess, Antiquity and Unity of the Race, 195-202.
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