140 HEREDITY IN RELATION TO EUGENICS 



the lateral incisors of the upper jaw, a second son had them 

 exceedingly dwarfed and some of his children had them so 

 stunted that they were unsightly. The absence of the last 



no 



kp 



nr9 D D]6 



iplipOjAoiioji 'ip 



2S 4N 3N 3N 2N N ;5 N S N S N. 



Fig. 113. — Pedigree chart, showing inheritance of spottedness in human 

 hair covering — "congenital lock of white hair." Affected persons in black 

 symbols. S, spot in hair-coat, sex unknown. Gossage, after Rizzoli. 



molar is perhaps the commonest variation but no good 

 evidence of its extended occurrence in families is at hand. 



ni666ti3 



Fig. 114. — Pedigree of heavy hair-coat. I, 3, heavy growth of hair on 

 head and face; I, 4, heavy growth of hair on head; II, 7, 8, heavy growth of 

 hair on head and face; II, 9, 10, heavy growth of hair on head. F. R.; Tin. 1. 



Entire absence of teeth is occasionally found as a family 

 trait — there are said to be several such families in America 

 but they have not yet been studied in detail. Guilford 



