49 (232) DOMINANCE. REVERSED DOMINANCE RECESSIVENESS OF 
a hereditary-pure (homozygous) variation DD. Now it is the question 
wether our knowledge of the descent of parents agrees herewith. 
Family 32c. According to the indices of the four grand-parents (see 
also 1920b, A 32) the formula of the parents is DR x RR. Three child- 
ren are in a high grade brachycephalic. 
Family 57b. Here, too, the formula of the parents is probably 
DR x DR. One child. 
Family 177c. The indices of the paternal grand-parents differ little. | 
They are 80 and 78.5. So the father can be DR. The maternal grand- 
parents are 85 and 79.5. If they represent the formula DR x RR, 
the index of the mother, 77, can be RR. Two children have the 
mdex:814 ys: 
Family 245a. In agreement with the indices of the grand-parents the 
constitution of the mother might be DR and that of the father RR. 
Six children are very much brachycephalic. This is an important 
family (cf. p. 24). There is here prepotence of the maternal grand- 
mother and of the mother. 
Family 324b. This is also a very important family which agrees with 
family 245a and with family 32c. According to the indices of parents 
the constitution of the index of the father is DR (1920b, A 324k, also 
table VIII 324k). Four sisters of the father’s are all brachycephalic. So 
it is obvious that we have to see in family 324k an example of domin- 
ance of macrobrachycephaly over macrodolichocephaly according 
to the formula DD x RR= DR. It may also be that the paternal 
grand-father is reversed dominant and has the constitution DR. Then 
the formula of the paternal grand-parents is DD x DR = DD + DR 
and the father can be DD. 
The mother is microdolichocephalic. The maternal grand-father is 
microbrachycephalic (83), the grand-mother is macrodolichocephalic 
(78). Nine brothers and sisters (1920 A 324a) have the indices 78, 78, 
79, 79, 81, 81, 81, 81, 82. So here there is some dominance of macro- 
dolichocephaly over microbrachycephaly. So for the mother we may 
accept the hereditary constitution DR. 
The formula of the parents can consequently be DR x DR, where 
these DR’s are not equivalent (of the father macrobrachycephaly is 
dominant over macrodolichocephaly, of the mother macrodolichoce- 
phaly is dominant over microbrachycephaly 1). Nine children are all 


1) But just microbrachycephaly. 
ee A et je se 
u CR ee 
ie Pp 
