1 66 Heredity and Social Progress 



how the acceptance of the former would 

 modify men's ideas of education. 



A theory of differentiation implies that two 

 differentiating objects are so united that the 

 strength of the whole is not that of each part 

 in isolation, but that of the strongest of both 

 parts in union. There is then a division of 

 labor by which each part does what it is best 

 fitted to do and the combination makes for 

 strength. Each person is made of combina- 

 tions of anabolic and katabolic cells. If the 

 outer body is anabolic, the inner body is kata- 

 bolic or the reverse. In the former case we 

 have a woman ; in the latter, a man. But 

 even if the detailed proof I have given is not 

 accepted, there is much inductive evidence 

 that the internal phenomena of men and of 

 women are the reverse of their external mani- 

 festations, to support the general facts against 

 any weakness of the detailed proof. What- 

 ever advantages accrue to anabolic tendencies 

 reach the race through the bodies of women 

 and the minds of men, while katabolic domi- 

 nance expresses itself in the minds of women 

 and the bodies of men. Women think quickly, 



