If we look at the earliest monuments of the human race, we find these race-characters as decided as the race-characters now. The earliest paintings or sculptures we anywhere have, give us the present contrasts of dissimilar types as strongly as present observation. Within historical memory no such differences have been created as those between Negro and Greek, between Papuan and Red Indian, between Esquimaux and Goth. We start with cardinal diversities; we trace only minor modifications, and we only see minor modifications. And it is very hard to see how any number of such modifications could change man as he is in one race-type to man as he is in some other. Of this there are but two explanations; ONE, that these great types were originally separate creations, as they stand--that the Negro was made so, and the Greek made so. But this easy hypothesis of special creation has been tried so often, and has broken down so very often, that in no case, probably, do any great number of careful inquirers very firmly believe it. They may accept it provisionally, as the best hypothesis at present, but they feel about it as they cannot help feeling as to an army which has always been beaten; however strong it seems, they think it will be beaten again. What the other explanation is exactly I cannot pretend to say. Possibly as yet the data for a confident opinion are not before us. But by far the most plausible suggestion is that of Mr. Wallace, that these race-marks are living records of a time when the intellect of man was not as able as it is now to adapt his life and habits to change of region; that consequently early mortality in the first wanderers was beyond conception great; that only those (so to say) haphazard individuals throve who were born with a protected nature--that is, a nature suited to the climate and the country, fitted to use its advantages, shielded from its natural diseases. According to Mr. Wallace, the Negro is the remnant of the one variety of man who without more adaptiveness than then existed could live in Interior Africa. Immigrants died off till they produced him or something like him, and so of the Esquimaux or the American.
Any protective habit also struck out in such a time would have a far greater effect than it could afterwards. A gregarious tribe, whose leader was in some imitable respects adapted to the struggle for life, and which copied its leader, would have an enormous advantage in the struggle for life. It would be sure to win and live, for it would be coherent and adapted, whereas, in comparison, competing tribes would be incoherent and unadapted. And I suppose that in early times, when those bodies did not already contain the records and the traces of endless generations, any new habit would more easily fix its mark on the heritable element, and would be transmitted more easily and more certainly. In such an age, man being softer and more pliable, deeper race-marks would be more easily inscribed and would be more likely to continue legible.