RESEARCHES INTO ANTHROPOLOGICAL HEREDITY 209 



children will be about 83 à 84, the index of the sons in this case 83,7 

 and that of the daughters 84,4. That the index of the daughters is 

 higher throughout than that of the sons may be due to the fact that 

 the women of the Faroes have a higher index than the men in all 

 cases known. Index cephalicus decreases in size from childhood till 

 adult age in the Faroes as in Selbu and Tydalen. The index found 

 in the sons and daughters will therefore have to be somewhat reduced. 

 It is, then, quite certain that the index of the offspring in the Faroes 

 as well as in Selbu and Tydalen tends to the value 83, whether the 

 index of the brachycephalic parents is higher or lower than the value 83. 



We may, therefore, draw the same conclusion from Jörgensen's 

 material as from mine, viz. that probably most of the offspring will 

 have indices higher than 80 if the indices of the parents are higher than 

 80. The small fraction with indices belows 80 is probably due to 

 heterozygoty of both parents. Considering the large collection it 

 may also be due to the presence of some brachycephalic -^- variants 

 with an index below 80. There are in Jörgensen's material as well 

 as in mine numerous cases of brachycephalic parents having some 

 mesocephalic children. If the nature of the offspring in the marriages 

 between brachycephalic parents is studied it will be found that 81 % 

 of the offspring are brachycephalic and 19 % mesocephalic in the 

 material of Jörgensen. My own material shows 76 % brachycephalic 

 and 24 % mesocephalic individuals in the offspring from a similar 

 group of parents. It must be said, that the correspondence between my 

 results with regard to this group and the results of Jörgensen is 

 very good. 



In tables 10 and 11 I have placed the cases where one of the 

 parents is phaenotypically brachycephalic, the other phaenotypically 

 mesocephalic, while the offspring is phœnotypically brachycephalic. As 

 will be seen, the sons are markedly more pronounced hrachy cephalic 

 than the daughters in the cases where the brachycephaly is due to the 

 father (table 10), whereas in the cases where the brachycephaly iS" due 

 to the mother, the dcmghters are more pronounced brachycephalic (2 

 indices) than the sons. The material is large enough, it seems, to ex- 

 clude the possibility of chance. The average index of the whole off- 

 spring is also in this case about 83,5. 



Based on the greater number of the families in these tables and 

 the great number of children the opinion seems well grounded that 

 the brachycephalic part of the parents represents homozygotes, and 

 that brachycephaly is dominant to mesocephaly. 



