THE AMERICAN NATURALIST [Vol. XLIV 



characteristics. After referring to the striking differ- 

 ences between the white X negro, the Indian X negro 

 and the Indian X white hybrids, and stating that the 

 Indian characters are the more deeply impressed on the 

 offspring, he says : 



I have known the offspring of an hybrid between Indian and negro 

 with an hybrid between Indian and white restime almost completely 

 the characteristics of the pure Indian. 



The conclusion from these various data, qualitative as 

 well as quantitative, is that skin color in negro X white 

 crosses is not a typical " blend" as conceived by those 

 who oppose the modern direction of research in heredity, 

 but that, on the contrary, the original grades of heavy 

 and slight melanogenesis segregate in the germ cells — 

 often imperfectly because of the multiplicity of units (or 

 grades) for skin pigmentation — and thus the original 

 color characters are more or less perfectly restored. 

 All studies indicate that blonds lack one or more units 

 that brunets possess; that the negro skin possesses 

 still additional units; that individuals with the heavier 

 skin pigmentation may have slight pigmentation covered 

 over — hypostatic, evidence of this condition appearing 

 in the light offspring of such hybrids in the second or 

 third generation; and that first-generation hybrids fre- 

 quently show, somatically, a color grade less than that 

 which they carry potentially and may segregate in their 

 germ cells. 



