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hitler on mutts:

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Walking about in the garden of Nature, most men have the self-conceit to think that they know everything, yet almost all are blind to one of the outstanding principles that Nature employs in her work. This principle may be called the inner isolation which characterises each and every living species on this earth. Even a superficial glance is sufficient to show that all the innumerable forms in which the life-urge of Nature manifests itself are subject to a fundamental law—one may call it an iron law of Nature—which compels the various species to keep within the definite limits of their own life-forms when propagating and multiplying their kind. Each animal mates only with one of its own species. The titmouse cohabits only with the titmouse, the finch with the finch, the stork with the stork, the field-mouse with the field-mouse, the house-mouse with the housemouse, the wolf with the she-wolf, etc. Deviations from this law take place only in exceptional circumstances. This happens especially under the compulsion of captivity, or when some other obstacle makes procreative intercourse impossible between individuals of the same species. Nature abhors such irregular intercourse with all her might and her protest is most clearly demonstrated by the fact that the hybrid is either sterile, or the fecundity of its descendants is limited. In most cases hybrids and their progeny are denied the ordinary powers of resistance to disease or the natural means of defence against attack. Such a dispensation of Nature is quite logical. Every crossing of two breeds which are not, of equal standing results in a product which holds an intermediate place between the levels of the two parents.