786 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



OFFICERS. GROUP 23 



WHITE. DRAFT, GROUPS t. H . IE 



WHITE DRAFT, GROUP 2 



NEGRO DRAFT, GROUP T2 



WHITE. DRAFT, INDIV. EXAMS. (SHERiOAN) 



NEGRO DRAFT. INDIV. EXAMS. (SHERIDAN) 



WHITE DRAFT, DISCHARGE RECOM. (GRANT) 



NEGRO DRAFT, DISCHARGE RECOM. (GRANT) 



26 



15 

 2A 

 23 



22 



21 



20 



19 



Id 



•7 



16 



15 

 $ 



3 l/v 



o' a 



IU 



i« 



2 



8" 



10 

 9 



6 



7 



6 



S 



IO 



20 



SO 



70 



ao 



90 



too 



•40 SO 60 



PERCENTILES 



Flo. 50. Percentile curves of intelligence scores. Comparison of intelligence of officer and draft groups as distributed on a combined scale. Alpha, 

 beta, and individual examination records could thus be thrown together to give a complete picture of each group. (Scores on combined scale 

 along vertical axis are to be interpreted as "under 1," "under 2," etc.) 



