HEREDITY IN MAN 



371 



kinds of ability combine to make a skilful surgeon, for example, 

 or an expert engineer or mechanic or musician, that in the absence 

 of exact knowledge we can only admit our ignorance of these 

 things. Of this fact we can be certain, that there is a heritable 



Normof man 

 NJ /Vormat woman 

 Feebfe'mfndect man 



m 



a/ 735 



-© 



m 



a/ 763 



Feeble-minded woman 



■<S) 



n^ 



m 



Undetermined man 



d inf Died In infancy 



D i770 % 



fJame/ess jj 



feeble-minded girt 1^ 



®- 



During (he Revo/ution 



^ 



II 

 35 







m- 



Diss 7 



Normal wife 

 After the Pe\'o/ution /-^ 



aomdv-^v®®^; 



d. 

 inf 



tftisOn 



Martiia 



m 



Deborah 



Fig. 203.— The Kallikak family. Of 

 the 480 descendants of this branch 

 of the family 143 (21%) were 

 feeble-minded; only 46 (9%) were 

 normal; of the rest 189 (68%) 

 are still undetermined. 24 were 

 confirmed alcoholics; 3 were crim- 

 inals; 3 were epileptics; 82 died 

 in infancy; 41 were degenerate. 



I 



^H-®®® (n)(n)[n](n) 





-(N) 



-O 



m 



■% 



Of the 496 descendants of this 

 branch of the familj-, none were 

 feeble-minded and all were good 

 citizens. Among them were edu- 

 cators, physicians, lawyers, judges, 

 traders, land-owners — men and 

 women prominent in every phase of 

 social life. Only 2 were alcoholics. 

 (From Coddard.) 



