460 



THE AMERICAN NATURALIST [Vol. LV 



tent, merely a different way of lookin<; at tlie same i\\m^. But 

 it puts the emphasis on the wronji; side and is wholly inadequate 

 to account for all the manifestations of hybrid viaor. Tt would 

 be unnecessary to discuss this were it not for the fact that his 

 way of looking at the matter leads him to think that there is no 

 essential distinction between the Darwinian view of inbreeding 

 as a process loading toward extinction and the more recent con- 

 ception that the results of this system of mating depend upon 

 the inheritance received. Collins says: 



. to light. Along with Tli.'sr typ.'s ulii.-li iuv tnilv .Ir-nierat.- in 

 ' any sense of tiie term (but inl)ree(liim' lias iiething to do with 



in comparison with their more hetero/voous [);iretits in tliat tliey 



conditions and are not .so productive. 1 iiljicedini;' is solely a 

 process of sortinir out. Some bad ni;ilcr'i;d is l.ntii'jlit to view 

 which can be discarded. But along with tins thnv is the 

 good material that was in th<> stock, and this ciii l.r iix'd to r."- 



