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THE AMERICAN NATURALIST [Vol.XLV 



intermediate forms is not known unless such a cross is 

 represented by families 8, 12, 22, 37, 42, 43 and 44. There 

 is a tendency toward segregation in these families, but 

 no kinky hair appears. 



Judging from this cursory analysis of the families 

 under consideration, the inferences are that in the cross- 

 ing of different grades of hair-form there is a tendency 

 towards segregation or alternate heredity, a modified 

 Mendelism, for there is not a perfect dominance, nor the 

 opposite, for either of the extreme grades of hair form, 

 kinky (woolly) or straight. 



It would be of interest to know what relationship the 

 curly, wavy or kinky hair of the European bears to the 

 same sort of hair of the Negrito. Presumably all of the 

 curly or wavy hair in the families under consideration is 

 of European origin except in families 17 and 32 of 

 Negritos, but in no instance can the previous inclusion 

 of Negrito blood be absolutely excluded. Some of the 

 wavy or curly hair may therefore be due to previous 

 crosses of the Filipino and Negrito. Presumably, also, 

 all of the straight hair is derived from the Filipino, but 

 again the European or Chinese straight hair can not be 

 excluded. It may be that the straight hair of the Chinese 

 and of the European would each have a different re- 

 action in heredity with the curved variety of both the 

 European and the Negrito. Unfortunately, observations 

 to determine this may not be possible owing to the mixed 

 condition of the population at the present time. 



It may be well to tabulate the families in which the 

 parents are alike and unlike in hair form and to note the 

 kind of hair of the children, in order to determine some- 

 what exactly the relative behavior of the different forms 

 of hair in heredity. The following crosses will be con- 

 sidered: Group I, straight X straight; group II, curly X 

 curly; group III, wavyXwavy; group IV, straightX 

 curly; group V, straight X wavy ; group VI, curly X wavy. 



In this and subsequent tables F. = father, M. = 

 mother. C. = curly. W. = wavy, S. = straight, F.F.= 



