772 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



JSlOjt 



GR-ADES. 0-4 YR5- 

 GRADE.5. 5-S YRS - 

 HIGH SCHOOL, 1-4 YRS.- 



ALPHA 



| I I "I I | I I I I | I I I I | I I I I | I I 



125 



ISO 



ni 



200 



BETA 



Figs. 38 and 39. Distribution of alpha and beta scores. The southern negro draft group is here broken up to show the intelligence scores which 



successive amounts of schooling accompany. 



