Control of Heredity: Eugenics 



251 



FIG. 92. RACES OF FOWLS, continued. (From Romanes.) 



cattle, sheep, or swine. These are only a few of the many illus- 

 trations which could be cited of the practical control of heredity 

 and evolution for human purposes. How have the present races 

 of domesticated animals and cultivated plants been produced? 



