THROUGH CUMULATIVE SEGREGATION. 
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 different 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. 
Imjpregnational 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 Roberts (1864), pp. 45-60. 
t For a definition of Negative Segregation see page 238 of this paper. 
LINN. JOURN.' — ZOOLOGY, VOL. XX. 21 
