260 



Heredity and Environment 



ity may be guided by man is forcibly illustrated by our present 

 races of domesticated pigeons which Darwin said would be 

 classed by any naturalist who did not know their origin in not less 

 than twenty different species and three different genera, though 



FIG. 89. RACES OF DOMESTIC PIGEONS, the wild rock pigeon being shown 

 in the center. (From Romanes, "Darwin and After Darwin.") 



