Social Environment and Eugenics 97 



birth of the great man will not apply through 

 the period of his development. Of course it is 



One hundred per cent is arbitrarily taken to represent 

 the ranking of the states in i860 in respect to environ- 

 ment. Then the Hne AB represents the tendency to fall 

 away from this ranking in respect 10 density of popu- 

 lation through successive years as indicated ; similarly 

 the line AC shows the change in per cent of illiteracy, 

 and AD in elementary education. Based on Table i, 

 correlations 21, 22, 22,, 2y, 28, and 30, Appendix. 



taken for granted that in any locality there 

 will be great environmental changes due to the 



