204 



HALFDAN BRYN 



Table 6 offers an example of a similar process of segregation. The 

 mesocephalic type is no doubt found in greater number within the 

 group of parents. It may be that one of the parents in the list is a 

 homozygote with regard to the mesocephalic type while the other is a 

 heterozygote (B X M). 



Assuming this to be the case we should expect to find the brachy- 

 cephalic and the mesocephalic types in equal number in the offspring. 

 In the offspring 5 individuals have the index 79; 15 have a lower index, 



TABLE 6. 



and 11a higher index. It must be remembered, however, that both 

 types have + variants and -J- variants on either side of the median line. 



The -f- variants of the brachycephalic type may of course go down 

 to 78, and the mesocephalic type may reach 81 à 82. 



I believe therefore that we shall have to be content to state that 

 even this table confirms the conclusions which might be drawn more 

 accurately from the tables already given. 



In table 7 I have put together a list of couples with dolichomeso- 

 cephalic indices with an offspring belonging wholly to the dolicho- 

 mesocephalic type. Here is no indication of any segregation. The off- 

 spring have all a mesocephalic index. The average index of the coup- 

 les is 78,09, and that of the offspring 77,37. If nos. 2 and 4 are not 



