100 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



This gives a total of 46,347 men under 10 years' mental age. It is extremely improbable that 

 many of these individuals were worth what it cost the Government to maintain, equip, and 

 train them for military service. 



A more detailed statistical summary is supplied by the following tables, which are relevant 

 alike to the present discussion and to later discussion of results of examining. 



Previous to April 28, 1918. — Until April 28 itemized weekly reports of the psychological 

 examinations made at each station were not required by the Surgeon General. The data for 

 this period are therefore not as complete as for the period from April 28, 1918, to the end 

 of the work. However, table 3 gives the approximate number of examinations for the early 



period. 



Table 3. — Approximate number of examinations previous to April 28, 1918. 



April 28, 1918, to January SI, 1919.— From April 28, 1918, to January 31, 1919, 1,556,011 

 men and 32,893 officers were examined by the Division of Psychology. Of these, 79,908 were 

 given individual examination (Table 4). 



Table 4. — Summary of psychological examining by months — May, 191S, to January, 1919. 



Month. 



May 



June 



July 



August 



September. 

 October... 

 Novemoer. 

 December. 

 January . . . 



Total 



Number 

 examined. 



221, 

 216 

 294: 

 327, 

 294, 

 105, 

 86, 

 42, 



1,588,904 



Individually 

 examined. 



Number. 



2,740 



8,763 



12,628 



21,376 



18,394 



10,174 



4,790 



1,032 



11 



79,908 



Percent 

 1.24 

 4.05 

 4.28 

 6.53 

 6.25 

 9.62 

 5.54 

 2.42 

 8.94 



5.03 



Total 

 alpha. 



179,551 



168,276 



203,806 



218, 523 



212, 670 



69, 404 



65,043 



32, 207 



114 



1,149,596 



Beta 

 only. 



Both 



alpha and 



beta. 



27,885 

 36,913 

 84,386 

 105, 669 

 80, 232 

 30,619 

 18,719 

 8,981 



393, 404 



13,710 

 19, 632 

 19,724 

 16,590 

 7,919 

 2,537 

 6,986 

 2,961 



90,065 



Total 

 beta. 



41,595 

 58,545 

 104,110 

 122,259 

 88,151 

 33,156 

 25, 705 

 11,942 



483, 469 



Point 

 Scale. 



739 



993 



2,145 



5,823 



5,562 



2,417 



916 



137 



18,732 



Stanford- 

 Binet 



1,457 

 5,243 

 5,658 

 9,485 

 9,078 

 4,712 

 2,138 

 713 

 5 



38, 489 



Perform- 

 ance 

 Scale. 



093 

 2,738 

 5,102 

 6,089 

 3,657 

 2,947 

 1,793 

 99 

 1 



23,119 



Of the entire number, 221,550 men and 199 officers (14.2 per cent) were negroes (Table 5). 



Of the 1,566,011 men, 25.3 per cent were unable to "read and understand newspapers and 

 write letters home," and were given the beta examination for illiterates. An additional 5.7 per 

 per cent, after failing the alpha examination for literates, also were given the beta examination 

 (Table 5). It is estimated that more than half of this 31 per cent were native-born Americans. 



Of the individual examinations, 23.3 per cent were made by means of the Point Scale, 47.9 

 by the Stanford-Binet, and 28.8 per cent by the Performance Scale (Table 5). 



The per cent of D— grades on examination alpha decreased, with fluctuations, from May 

 to December, largely due to the change of grading basis in June, and again in August. The 

 per cent of D — grades on beta depended largely on the proportion of negroes coming into camp, 

 being highest for August when the proportion was greatest. The per cent of D — and E grades 

 on individual examinations was irregularly affected, during the latter part of the examining, by 

 the fact that some of these cases were men referred by their commanding officers for ex- 

 amination (Table 5). 



