KKSEARCHES INTO ANTHROPOLOGICAL HEREDITY 207 



type. There are grounds for the belief that one of the parents belongs 

 to the homozygote mesocephalic type, the other to the heterozygote 

 dolicho X mesocephalic type. The material is, I am sorry to say, too 

 small to allow positive conclusions. However, much favours the belief 

 that the dolichocephalic type is dominant to the mesocephalic type. 

 The result would then be: DMX MM = 2 DM + 2 MM. One half of 

 the offspring should be dolichocephals, the other half mesocephals. 

 In this case 11 have indices of 75 or lower, 13 indices of 76 or hig- 

 her. The average index of the 11 assumed to be heterozygote do- 

 lichocephals will be 72,3, that of the 13 mesocephals 77, i. Also in this 

 case we shall have to take into consideration that many of these indivi- 

 duals are children. No. 64 is particularly interesting. Here one of the 

 parents has the index 80,2, the other 74,4. There were 3 children, who 

 were all dolichocephals. The explanation may be that both parents 

 are homozygotes, one MM, the other DD. As the dolichocephalic type 

 seems to be dominant to the mesocephalic type, it is quite in accord 

 with the Mendelian laws that the whole offspring will be dolicho- 

 cephalic. But as there are only 3 children, the possibility is not ex- 

 cluded that the following children will be mesocephals. If so, this 

 case properly belongs to table 8, where I also for the sake of accuracy 

 have placed it. It appears from the facts here stated that the popula- 

 tion examined does not constitute a homogeneous body with regard 

 to the cephalic index. We may say that there is a brachycephalic type 

 with the index about 83 in the population. If both parents are of this 

 lype the bulk of their offspring will have an index not essentially 

 varying from index 83. 



We may also say that there is found a biotype with a cephalic in- 

 dex of about 78 in the population here described. 



Granted that both parents are of this type all their offspring 

 will have an index only slightly varying from index 78. 



We may also conclude with great probability that there will be 

 found in the same population one type with an index about 73. 



This group is not so numerous that we in the series studied have 

 been able to find marriages, where both partners are homozygotes of 

 this type. If the partners belong to different types of those here 

 mentioned, or if they are heterozygotes, a segregation will found to 

 take place in the offspring in accord with the Mendelian laws. The 

 brachycephalic type is dominant to the mesocephalic type as well as 

 to the dolichocephalic type. This last type seems, further, to be do- 



