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. But I have no pretence to speak on such matters; this paper, as I have so often explained, deals with nation-making and not with race-making. I assume a world of marked varieties of man, and only want to show how less marked contrasts would probably and naturally arise in each. Given large homogeneous populations, some Negro, some Mongolian, some Aryan, I have tried to prove how small contrasting groups would certainly spring up within each--some to last and some to perish. These are the eddies in each race-stream which vary its surface, and are sure to last till some new force changes the current. These minor varieties, too, would be infinitely compounded, not only with those of the same race, but with those of others. Since the beginning of man, stream has been a thousand times poured into stream--quick into sluggish, dark into pale--and eddies and waters have taken new shapes and new colours, affected by what went before, but not resembling it. And then on the fresh mass, the old forces of composition and elimination again begin to act, and create over the new surface another world. 'Motley was the wear' of the world when Herodotus first looked on it and described it to us, and thus, as it seems to me, were its varying colours produced.