

ONE STRONGLY DEVIATES. 1221829 
parents the mother only has a somewhat larger than average large 
head. In the 7 families in which one of the parents has a small head 
and the other one a large one, in family 1 and in family 298 one of the 
parents has a very large head, in the families 22e, 19a and 17 a tolerably 
large head. So we see that in the families where the deviating high 
index belongs to a small head, the heads of the parents most times are 
also small. 
As regards the indices of parents, in 8 cases (22e, 196, 27, 298, 224, 
164, 228 and 19a) both parents are dolichocephalic; in 5 cases (268, 
1, 18a, 17, 53b) one of the parents is brachycephalic. 
In the group of 5 cases (p. 24) in which the high deviating index 
belongs to a large head, in 4 cases one of the parents was brachyceph- 
alic and one dolichocephalic. Here in the group of 13 cases where the 
high deviating index belongs to a small head, we find but 5 such cases. 
For these we may accept the formula DR x RR = DR + RR. This 
is the case for the families 268, 18a and 53b. Family 1 (p. 26) may 
be considered as dominance of brachycephaly with surpassing of the 
index by the children. Family 17 is an example of the formula DR x 
RR, but here the microbrachycephalic index is recessive (p. 34). 
That, according to the formula DR x RR = DR + RR, we find a too 
small number of heterozygotes (high indices) is due to their being 
selected cases. The choice has here a contrary influence as for table 
basée pr 9): 
Now we must still give an explanation of the 8 cases where both 
parents are dolichocephalic. To them also belongs family 4la of 
group ba (p. 24). In this family, in the other known family- 
members (p. 24) of the mother’s, we have an important indication 
that the mother is hereditary dolichocephalic (RR). The maternal 
grand-mother of the father is microbrachycephalic. So through the 
father one son can be brachycephalic. This child has a little larger 
than average large head. So this family can suffice for the formula 
DIES ck == DR EIRE: 
For family 22e the same reasoning is available. The paternal grand- 
‘mother has a just average large head and the grand-father a very 
large one. The little daughter with the brachycephalic index has a 
somewhat smaller than average large head so it agrees very much with 
the grand-mother. Therefore here, too, just as in family 41a there is 
reversed dominance of the father’s index. 
