124 



HEREDITY AND EUGENICS 



as several cousins of different degrees of relationship." 

 Hence the condition can be transmitted through 

 (unaffected) inales. This woman's mother, grand- 

 mother, and female relations backwards for seven 

 generations were similarly affected. " No female 

 who had attained her tenth year of age was without 

 them, whilst none of the males in the family ever had 

 them." In another family exactly the same manner 

 of inheritance occurred, a woman, the mother, 

 mother's mother, and so on, for two more generations, 

 all having scalp tumours, as well as several female 

 first and second cousins on the mother's side. Again 



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¥ 



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i^i 



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/2 



d.3 9 



2k. 15 



13 



D 



5 



Fig. 26. — Family showing Early Decay of Teeth. 

 The numbers beneath are the respective ages of the children. 



all the females and none of the males developed the 

 condition. 



A striking case of abnormal early decay and loss 

 of the teeth in three generations of a family is given 

 by Sedgwick (1863). It is confined to the females 

 (see Fig. 26), and there is no evidence as to whether 

 it is transmitted by the males. 



Among family peculiarities which are known to be 

 inherited, one of the most notable is the large lower 

 lip and prognathous jaw of the Hapsburgs. Bateson 

 (1909) first suggested that this peculiarity was a 

 Mendelian dominant, and Haecker (191 1), from a 

 study of numerous portraits, confirms this conclusion. 

 The peculiarity dates back at least to Duke Ernst the 



