442 



TABLE II. 

 Series of indices a single one of wliich strongly deviates 



view, that segregation occurs with the heredity of the shape of the 

 head, and that some pairs of factors of heredity are concerned in it. 

 A second question is, if, with this alternative heredity, the first 

 bastard-generation (i^J is intermediary or that there exists dominance. 

 If, as Hurst indicates from literature, brachycephaly is dominant 

 over dolichocephaly, only dolichocephalic children will be boi-n from 

 the marriage of two dolichocephalic persons. For the brachycephalic 

 headform is then defined by the factor D (dominant) the dolicho- 

 cephalic one by the factor R (recessive), the former can be represented 

 by the formula DD or DR, the latter only by RR and the pairing 

 of two RR'ii gives only RR descendants. The great variability, the 

 non-occurrence of families in whom a definite headform is nearly 

 constantly inherited, the complication in the cases, in which three 

 generations are completely known brought us to the conclusion, 

 that not one single pair of factors determines the inheritance of the 

 headform, but we think it possible that some more factors working 

 in the same direction are active in this respect. Moreover dominance 

 may occur, and the occurrence of families (table III) among whom 

 only comparatively low head-numbers are found, seems to speak 

 in favour of it. Families (table IV) of whom one of the parents is 

 brachycephalic, and all or most of the children are brachycephalic, 



