a person of pure racial blood makes correct decisions, that is to say, decisions that are coherent and uniform, the person of mixed blood will become confused and take measures that are incoherent. Hence we see that a person of mixed blood is not only relatively inferior to a person of pure blood, but is also doomed to become extinct more rapidly. In innumerable cases wherein the pure race holds its ground the mongrel breaks down. Therein we witness the corrective provision which Nature adopts. She restricts the possibilities of procreation, thus impeding the fertility of cross-breeds and bringing them to extinction.