For instance, if an individual member of a race should mingle his blood with the member of a superior race the first result would be a lowering of the racial level, and furthermore the descendants of this cross-breeding would be weaker than those of the people around them who had maintained their blood unadulterated. Where no new blood from the superior race enters the racial stream of the mongrels, and where those mongrels continue to cross-breed among themselves, the latter will either die out because they have insufficient powers of resistance, which is Nature's wise provision, or in the course of many thousands of years they will form a new mongrel race in which the original elements will become so wholly mixed through this millennial crossing that traces of the original elements will be no longer recognizable. And thus a new