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SECTION III. 



EXAMPLES TENDING TO PROVE THAT THE INTERMIXTURE 

 OF CERTAIN RACES OF MEN ARE NOT EUGENESIC. 



In the first part of this essay we have endeavoured to es- 

 tablish that certain human CTOss-breeds possess an unlimited 

 fecundity, both in their direct alliances and with either of the 

 parent races, whence we have inferred that eugenesic hybridity 

 really exists in mankind. 



We intend now to investigate the results of certain intermix- 

 tures more disparate, and review a number of facts tending to 

 the conclusion that all human cross-breeds are not eugenesic. 



Let us observe at the outset, how far the phenomena of eu- 

 genesic or non-eugenesic hybridity may affect the solution of 

 the great question pending between the Monogenists and the 

 Polygenists. 



What in animals in general, characterises the eugenesic 

 hybridity, is the unlimited fecundity of mongrels of the first 

 degree between themselves. It is by no means necessary that 

 the parent species should be as prolific in their crossings as in 

 their direct unions, nor that the mongrels should be as produc- 

 tive as their parents, as large, as strong, and as long-lived, etc. 

 Supposing, for instance, that the she-wolf conceives with more 

 difficulty with the mastiff than with her proper mate; supposing 

 even that this crossing is only efficacious by way of exception ; 

 that it succeeds only once out of ten, instead of succeeding 

 constantly as it occurs in animals of the same species; it would 

 be sufficient, if in this tenth case the mongrels are very prolific 

 to pronounce the crossing eugenesic. Supposing also, that the 

 hybrid wolf-dogs of the first degree produced only litters of about 

 two or three, that is to say, only half the number usually pro- 

 duced by she-wolves and bitches, the result would be that this 

 intermediate race would breed less rapidly by half than the 

 pure species; but, provided the productiveness of the mongrels 

 does not descend below the degree necessary for the preserva- 



