Once for all, such arguments seem to me unworthy of real science, and I do not wish to place myself upon so narrow and unsafe a ground. If Mungo Park, or the brothers Lander, have given to some negro a certificate of superior intelligence, who will assure us that another traveller, meeting the same individual, would not have arrived at a diametrically opposite conclusion concerning him? Let us leave such puerilities, and compare, not the individuals, but the masses. When we shall have clearly established of what the latter are capable, by what tendencies they are characterized, and by what limits their intellectual activity and development are circumscribed, whether, since the beginning of the historic epoch, they have acted upon, or been acted upon by other groups--when we shall have clearly established these points, we may then descend to details, and, perhaps, one day be able to decide why the greatest minds of one group are inferior to the most brilliant geniuses of another, in what respects the vulgar herds of all types assimilate, and in what others they differ, and why. But this difficult and delicate task cannot be accomplished until the relative position of the whole mass of each race shall have been nicely, and, so to say, mathematically defined. I do not know whether we may hope ever to arrive at results of such incontestable clearness and precision, as to be able to no longer trust solely to general facts, but to embrace the various shades of intelligence in each group, to define and class the inferior strata of every population and their influence on the activity of the whole. Were it possible thus to divide each group into certain strata, and compare these with the corresponding strata of every other: the most gifted of the dominant with the most gifted of the dominated races, and so on downwards, the superiority of some in capacity, energy, and activity would be self-demonstrated. After having mentioned the facts which prove the inequality of various branches of the human family, and having laid down the method by which that proof should be established, I arrived at the conclusion that the whole of our species is divisible into three great groups, which I call primary varieties, in order to distinguish them from others formed by intermixture. It now remains for me to assign to each of these groups the principal characteristics by which it is distinguished from the others. The dark races are the lowest on the scale. The shape of the pelvis has a character of animalism, which is imprinted on the individuals of that race ere their birth, and seems to portend their destiny. The circle of intellectual development of that group is more contracted than that of either of the two others.