Control of Heredity: Eugenics 



251 



WjswHM.wb& 

 Fig. 92. Races of Fowls, continued. (From Romane 



s.) 



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? 



