44 HEREDITY 



finest breeds of cattle and our best egg-producing fowls, 

 can reach their full perfection only under closely regu- 

 lated conditions ; and improvement is frequently made 

 possible only when we find means of improving the 

 environment. 



Nurture, in the wide sense, must remain a matter of 

 extreme importance for the race even if, as seems 

 likely, its effects pass away with the individual Hie. 



