With regard to the other more marked races, it is known that the law of Northern latitudes is, the lessening of physical development and capacity, from the temperate toward the colder zones. In these last, the blood of men grows colder and more sluggish, and their bodies grow smaller and weaker. Extreme cold is unfriendly to the element of life; and under its influence, acting directly on man, and indirectly on his condition, from the soil, the Northern races received their stunted proportions of figure and mental energy—such as we witness in the Esquimaux and other tribes, of the same high latitudes.
We should not calculate the climatic effects of primitive times, from the result of experience or observation now-a-days. The conditions of men are not exactly what they were, even in those places we consider barbarous. In the beginning, men were ignorantly exposed to all the rude shocks of the elements for generations, and lived and propagated the conditions which those elements impressed upon them. All the deteriorating influences of savage life, working in a very vicious circle, effected then what can no longer be effected, in a general way, so decidedly and remarkably. People, now, can move about and live in extreme latitudes, and yet keep for generations their peculiar traits and conformation. But they have comfortable means and appliances about them, and hold themselves aloof from the barbarisms peculiar to the place. In this way, the climatic influences are resisted for ages.
Those who argue for a distinct species in the case of the blacks, and do not believe in the slow changes produced by geographical position and the elements, will point to the fact, that Negroes taken into temperate latitudes, and propagating purely for a few generations, have appeared to be Negroes still—not much the whiter for the experiment. But it has not been a full and a fair one. Nature produces her permanent results very slowly. She took hundreds of years to bake, and blacken and flatten, and lanify the nigger, and hundreds more to harden his osteology—to burn, as it were, his traits into his clay; and if the man is to be unbaked, unblackened, and so forth, she must have something of the same time, in which to reverse her operations. It would take four or five hundred years, at least, to bleach Pompey or Lucretia. Perhaps at Spitzbergen, or some of those hyperborean places—