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MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



men of the several camps, as well as the percentage distribution of the total actually reported 

 from all four camps. The final column shows the percentage distribution of a total made up 

 of the four camps so combined that equal weight is assigned to each. It is evident from the 

 table that it makes little difference in this case which method of combining is used. 



Figure 3 presents graphically the percentage distributions of the four camps. Superim- 

 posed on the distribution for each camp is that for the four camps averaged. Though com- 

 parison of camps is not our purpose at this point, it is of interest to bear in mind the status of 

 each camp with reference to the whole. Certain conspicuous differences in type of curve also 

 appear. Means, with their probable errors and standard deviations, are indicated on each 

 figure and given also in table 147. 



In spite of all limitations which have been noted on the completeness and the random 

 character of these samples they nevertheless represent more nearly than any data on menta 

 measurements hitherto available random samples of the adult male population. As such 

 they should be of great service in furnishing standards of reference for use in interpretation 

 of other groups. 



Table 146. — Percentage distribution of scores by camps: Examination a — Enlisted men (white) — Literate cases only. 



1 Indicates less than 0.1 per cent. 

 Table 147. — Examination a — Means and standard deviations — White enlisted men by camps. 



