24 (216) SERIES OF INDICES OF WHICH A ‚SINGLE 
Family 4la. The mother is microdolichocephalic. The maternal 
grand-father and 8 brothers and sisters (1920b, B 32) are all dolicho- 
cephalic, the grand-father has a very large head. The father, too, is 
microdolichocephalic; the paternal grand-mother is just brachycepha- 
lic and has a small head. A young son and a young daughter are macro- 
dolichocephalic. A 2nd son, a child of 8 months, is macrobrachyceph- 
alic. The head dimensions of the children are not far above the mean. 
This case may also be classified into table II. 
Family 245. The eldest daughter is in a high grade macrobrachy- 
cephalic. This woman has a husband who is macrodolichocephalic 
(1920b, E 245a). There are 6 brachycephalic children (82—86). The 
presence of this macrobrachycephalic head with a high dominance or 
prepotencein the proper off-spring is not to be explained from the data 
of family 245. One might also classify this family into table II with 
prepotence of the father. i 
According to the mendelian way of explanation the macrobrachy- 
cephalic daughter of family 245, who, as a mother, in family 245a has 
6 brachycephalic children, must be a homozygote. With respect to 
the data of family 245 we should feel inclined to consider them as 
heterozygotes (DRX RR = DR+RR). To make a mendelian explan- 
ation possible we must accept here that both parents have the con- 
stitution DR x DR or DD x DR. The father has gametes with 
varying prepotence. The macrobrachycephalic daughter transports 
this prepotence on her children (see also p. 40). 
Family 215. The father is microdolichocephalic. The. a Is 
brachycephalic; the head is somewhat smaller than average large. 
The maternal grand-father is macrobrachycephalic. Of 2 children the 
son is macrodolichocephalic and the daughter macrobrachycephalic. 
This case may be considered as an example of segregating heredity 
according to the formula DR x RR. The daughter’s index is higher 
than the mother’s through the high index of the maternal grand-father. 
A conform case is probably family 339a. The father is very macro- 
dolichocephalic. The mother is brachycephalic and has an average 
large head. The maternal grand-mother is macrobrachycephalic. Two 
of the four sons are dolichocephalic, one with a large head and one 
with a small one; the two other sons are brachycephalic with an 
average large head. Of four daughters three are dolichocephalic, two 
with large heads and one with a small one; one daughter is macro- 
ages Er 
ae Er 
