CONTROL OF HEREDITY: EUGENICS 413 



has served to bring this whole subject of eu- 

 genics into disrepute among thoughtful men. 



To a considerable extent the ideals regard- 

 ing individuals and society have differed in 

 different ages and races in the past, but with 

 the closer communications which have been es- 

 tabhshed between all parts of the earth in 

 modern times there has developed a greater 

 uniformity of ideal. In a complex society all 

 types of service are needed and many differ- 

 ent types of individuals are socially useful. If_ 

 the social good were the supreme end, as it is \ 'i 

 in a colony~of ants or bees, the greatest dif- 

 ferentiation of individuals for particular kinds 

 of service would be desirable. There should 

 be a hereditary class of laborers, of business 

 men, of scholars, of artists, etc., and for the im- 

 provement of each class there should be in- 

 breeding in that class. Such methods are now 

 used by breeders of various races of domestic 

 animals and cultivated plants with the best of 

 results. No breeder would think of trying to 

 improve draft horses by crossing with race 

 horses, nor of improving milk cows by crossing 

 with beef cattle. In other countries and ages 



