MEAN MENTAL AGE 



o o 



en 



Oi * en CJi bi *cn en 



15,544 



948 

 C 93,965 

 W '»2I4 



m 



^ 1,610 

 O 



Tl 



O 597 

 > 



^ 573 



2,701 



4,002 



AVERAGE MENTAL AGES OF DRAFTED SOLDIERS 



Figure 11. By psychological tests, the "mental age" of a man is measured in comparison 

 with what is assumed to be the normal development of the mind. The above graph shows that, 

 compared with the average (13.08 years) of the whole white draft, many of the men of foreign 

 birth made surprisingly low scores; while the average adult negro showed only the intelligence 

 of the average 10-year old white schoolboy. 



These striking racial differences are 

 brought out from a slightly different 

 point of view in Fig. 10. Here the 

 great bulk of the American nation is 

 taken as the standard of division, 

 and the graph shows, to the right of the 

 dividing line, the percentage of sol- 

 diers above average mentality, and 

 to the left of the line, those below the 

 average white American mentality. 



It is at once obvious that the 

 number of superior men contributed 

 by a country will not furnish a basis for 

 predicting the number of inferiors 

 furnished by that country. There 

 is some correlation, however, — the 

 amount was not measured. From a 

 eugenic point of view, the contribu- 

 tion of superior individuals is in 

 many ways more important to the 

 nation than the number of inferior 



individuals sent over as immigrants: 

 hence the countries have in this graph 

 been ranked in proportion to the 

 number of individuals of A or B men- 

 tality whom they contributed to this 

 sample of the draft. 



It is apparent that, aside from 

 English-speaking countries, only Hol- 

 land and Germany made contributions 

 that averaged fairly well with the bulk 

 of the American population. And 

 worst of all, the proportion of immi- 

 grants from these countries during 

 the last quarter of a century has been 

 small. The great bulk of recent 

 immigration to the United States has 

 been made up of Slavic and Mediter- 

 ranean peoples; and the startlingly 

 inferior quality of these immigrants, 

 from a psychological point of view, 

 has rarely been more strikingly shown 



