BIOLOGY IN HUMAN AFFAIRS 



with public health, penology, education, suffrage, and 

 immigration — to mention only a few. The keystone of 

 this philosophy is the proper recognition of the precise 

 significance of genetic constitution, environment, and 

 experience as determining factors in human behavior. I 

 venture the opinion that the twentieth century concept 

 of the gene as the unit of inheritance will have as much 

 influence in directing our approach to sociological questions 

 in a scientific manner as the nineteenth century doctrine of 

 evolution had on the problems of technical biology. 



[196] 



