8o 



HEREDITY AND EUGENICS 



first case of Mendelian inheritance demonstrated 

 in man. 



Drinkwater (1908) independently investigated a 

 British family, with the same results as regards 

 inheritance. He found that the strength of grip in 

 brachydactylous individuals was considerably below 



Fig. 14. — Radiogram of a Brachydactylous Hand, showing 

 THE Two Phalanges in Each Finger. (After Drinkwater.) 



the average. They complain that they cannot play 

 the piano or any other musical instrument requiring 

 normal length of fingers, their grasp of objects is 

 smaller than normal, and the women cannot do 

 netting. That they are handicapped is shown by the 

 fact that their social position is lower than that of 



