THROUGH CUMXTLATIVE SEaREGATION. 



269 



Ainos. This fact has doubtless helped to cause the divergence 

 of opinion with regard to Aino hairiness. For the com- 

 paratively smooth half-breeds usually speak Aino, dress Aino- 

 fashion, and are accounted to be Ainos, so that travellers are 

 likely to be misled, unless constantly on their guard. There 

 seem to be half-breeds in all the villages whither Japanese 

 pedlars and fishermen have penetrated. There have therefore 

 probably, at some time or other, been half-breeds in every 

 portion of Japan where the two races have come in contact." 



If these . two races were equal in civilization and in natural 

 adaptation to the environment, or if one race was specially 

 adapted to mountain life and the other to life by the sea-shore, 

 it seems probable that they might permanently occupy adjoining 

 countries without losing any of their distinctive characteristics. 

 Broca, after careful collation of all the information that could be 

 gathered from the publications of travellers and historians, reaches 

 the conclusion " that alliances between the Anglo-Saxon race and 

 the Australians and Tasmanians are but little prolific ; and that 

 the mulattoes sprung from such intercourse are too rare to have 

 enabled us to obtain exact particulars as to their viability and 

 fecundity."* I have no means of knowing whether later investi- 

 gations in Australia and other parts of the world have thrown 

 fuller light on the mutual fertility or sterility of the more diver- 

 gent human races, but I am inclined to think that the interest in 

 the subject has declined since Darwin has shown that such data 

 can never afford proof that the diff'erent races of man are not 

 descended from common ancestry. There are, however, signs 

 that a renewed interest in the subject is being awakened through 

 the realization that it has a direct bearing on the theory of the 

 origin of species. 



Impregnational Segregation a Cause of Divergence in both its 

 Earlier and Later Stages. 



As we have already seen, the negative factors f Segregate 

 Vigour and Segregate Fecundity would tend to produce extinc- 

 tion if not associated with positive forms of Segregation. But 



* See 'Phenomena of Hybridity in the Genus Homo.' By Paul Broca. 

 English translation, published for the Anthropological Society of London by 

 Longman, Green, Longman, and Eoberts (18G4), pp. 45-60. 



t For a definition of Negative Segregation see page 238 of this paper. 

 LINN. JOUEN.— ZOOLOGY, VOL. XX. 21 



