Summary

Portrait of Paul Broca Paul Broca On the Phenomena of Hybridity in the Genus Homo

It is, therefore, unnecessary that in order a mixture should be eugenesic the fecundity of the cross-breed should be absolutely equal to that of individuals of pure blood. Had it been demonstrated by strict numbers, that a mixed race, by the simple fact of intermixture breeds less rapidly than the two parent races, and were it demonstrated that it presents a greater number of cases of sporadic sterility, it would by no means result from it that this mixed race is incapable of maintaining itself and increasing by itself.
Source: Gutenberg

Portrait of Paul Broca Paul Broca On the Phenomena of Hybridity in the Genus Homo

When, therefore, a physiologist wishes to demonstrate the existence of that degree of hybridity which we have termed eugenesic, he selects two perfectly recognised distinct species of animals, crosses them, studies their breeds, and if he finds that they are indefinitely prolific, it is sufficient for him to affirm the existence of eugenesic hybridity—that is to say, that the physiological definition of the species is unacceptable.
Source: Gutenberg

Portrait of Paul Broca Paul Broca On the Phenomena of Hybridity in the Genus Homo

This has been advanced, not by travellers who have precisely asserted the contrary, but by honest and sensible reasoners, whose refined taste revolted at the aspect of the portraits and busts of the Australian women. It would be a serious fact that a whole race should have such an irresistible repugnance to another, for nature has only inspired with such a feeling of repulsion beings of different species, and man is certainly of all animals the least exclusive.
Source: Gutenberg

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