From the first glance we see that, in the negro, we are in the presence of a being differing profoundly not merely from the white man but also from those human types which we discovered in our surveys of the brown and yellow worlds. The black man is, indeed, sharply differentiated from the other branches of mankind. His outstanding quality is superabundant animal vitality. In this he easily surpasses all other races. To it he owes his intense emotionalism. To it, again, is due his extreme fecundity, the negro being the quickest of breeders. This abounding vitality shows in many other ways, such as the negro's ability to survive harsh conditions of slavery under which other races have soon succumbed. Lastly, in ethnic crossings, the negro strikingly displays his prepotency, for black blood, once entering a human stock, seems never really bred out again. Negro fecundity is a prime factor in Africa's future. In the savage state which until recently prevailed, black multiplication was kept down by a wide variety of checks. Both natural and social causes combined to maintain an extremely high death-rate. The negro's political ineptitude, never rising above the tribal concept, kept black Africa a mosaic of peoples, warring savagely among themselves and widely addicted to cannibalism. Then, too, the native religions were usually sanguinary, demanding a prodigality of human sacrifices. The killings ordained by negro wizards and witch-doctors sometimes attained unbelievable proportions. The combined result of all this was a wastage of life which in other races would have spelled a declining population. Since the establishment of white political control, however, these checks on black fecundity are no longer operative. The white rulers fight filth and disease, stop tribal wars, and stamp out superstitious abominations. In consequence, population increases by leaps and bounds, the latent possibilities being shown in the native reservations in South Africa, where tribes have increased as much as tenfold in fifty or sixty years. It is therefore practically certain that the African negroes will multiply prodigiously in the next few decades.