

MICROBRACHYCEPHALY. PREPOTENCE. (235) 43 
grand-father is microdolichocephalic. The father is microbrachyceph- 
alic just as both paternal grand-parents. One child. 
Family 179c. The mother and the maternal grand-mother are macro- 
dolichocephalic. 
Family 216c. The mother and seven sisters (1920b, B 216) are doli- 
chocephalic. 
Family 269b. The mother and the maternal grand-father are micro- 
dolichocephalic, the grand-mother is macrodolichocephalic. 
In all the cases of table VIII where the low index is dominant, the 
indices of the grand-parents, as far as they are known, are also low. 
In table VII where the high index is dominant we also find a single 
case in which of the low index that is recessive here two grand-parents 
(family 32c) or one of the grand-parents (family 66, 328a, 331, 363) 
have low indices. 
In table VI in the families 34b and 73b the father and the paternal 
grand-parents have low indices, whilst the indices of the children are 
grouped more or less round those of the father. In family 73b the 
mother is microbrachycephalic. 
The circumstances which decide whether brachycephaly (high 
index) or dolichocephaly (low index) is dominant are then in the 1St 
place the size of the head with the high index and in the 24 place the 
prepotence of the indices of parents either through personal or through 
ancestral influence. 
Table IX. Large difference in the indices of parents. Some child- 
ren follow the index of the father, other ones that of the mother. 
19 families and 16 incomplete ones. 
Many of these families have the same significance as those of table 
VI. In a few of them the indices of the sons agree with those of the 
father and those of the daughters with the mother’s; f. 1. in the fam- 
ilies 73, 81, 173d, 179f and perhaps in the incomplete family 53a. As for 
the influence of sex on the heredity of headform we intend to treat it 
later (cf. also 1919, p. 357). 
Taking in view the knowledge of the grand-parents, parents’ indices, 
_ then for family 34c the formula DR x RR = DR + RR should be 
applicable. Also for the families 88, 179d, 179f, 324g. In these 5 families 
8 sons and 11 daughters have been measured. There are 9 children 
with a high index and 10 with a low one which is in agreement with 
the theory. (1 : 1). 
