60 (252) SUMMARY. 
parents and children has the same hereditary composition. (tab. IV). 
Important is in a series of indices of children the occurrence of a 
single much deviating index (tab. V). When it regards a low index then 
the occurence may be interpreted from the dominance of brachy- 
cephaly over dolichocephaly (DR + DR = DD + 2DR + RR). We 
have then to do with special cases of tab. I, where the child with the 
recessive index evidently deviates from those with the dominant in- 
dices (one of four cases). 
Generally the deviating index is high. Further investigation shows, 
that the deviating index is often high and belongs to a small head. Ac- 
cording to these cases there is a recessive microbrachycephalic head. 
There are also cases where the deviating index is probably a modific- 
ation (youngest child). 
In the families where the deviating high index belongs to a small 
head, the heads of the parents generally are also small. 
Tab. VI—IX further show us the phenomenon of dominance 
with the heredity of headform. There is dominance of the high index 
over the low one (brachycephaly over dolichocephaly), yet there is also 
reversed dominance. This reversed dominance is often only seemingly. 
The high index being dominant it often belongs to a large head (tab. 
VII) it being tecessive, the index often belongs to a small head (tab. 
VIII). In many cases the indices of children are intermediate (tab. VI). 
As regards sex, in tab. VII in 32 families the high index is that of 
the mother and in 18 cases that of the father. 
The fact that of the families of tab. V the deviating high index is 
often that of a small head is in agreement with the result of tab. VIII, 
namely the recessiveness of this high index. 
Statistically it has been found that the variability of indices of child- 
ren of brachycephalic parents is larger than of dolichocephalic 
parents. 
The inquiry of tab. VI—IX teachesus another property of the phenom- 
enon of prepotence. It appears that individuals who posses sa charact- 
eristic in a heterozygous form can have prepotence for this charact- 
eristic. So there is an essential difference between dominance and 
prepotence; dominance being a property of homozygous individuals. 
The circumstances that decide whether brachycephaly (high index) 
or dolichocephaly (low index) is dominant are then in the first place 
the size of the head with the high index and in the second place the 
