Inheritance of Human Characters 127 



Persons so rendered deaf would not transmit the 

 affliction to their children any more than they 

 would transmit bhndness if the eyes of the 

 parents were put out by accident. 



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Fig. 9. — Inheritance of one form of cataract. Modified 

 from Nettleship's chart. The diagram reads thus: A man with 

 cataract married a normal woman; of their eight children six 

 were afltected with the disease. One of these married an un- 

 affected man; three of the children of this union were normal, 

 sex unrecorded, two defective. This same man married a 

 second wife who was normal; their eight children were all un- 

 affected. So continue reading through five generations. 



Feeble-mindedness apparently behaves as a 

 Mendelian recessive. Goddard's studies of the 

 family pedigree of the inmates of the Vineland, 

 New Jersey, institution for the care of the 

 feeble-minded gives us an abundance of material 



