562 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



camps on the Hollerith machines and no other such data are therefore available. The discrep- 

 ancies are small and the columns of the table serve thus to give an approximate knowledge of 

 the constitution of each group. 



It was initially planned to select a group of negro officers (Group VII). This group was 

 omitted because it was found that there were only a few hundred cards available. 



Group VIII: White established organizations. — This group was selected to provide comparison 

 between various arms of the service. In it records of men in the various military organizations 

 of divisions and camps were taken in large enough numbers to permit of intercomparison. 

 According to an original plan it was intended to select at least a thousand cards for every group 

 and to take this thousand in four packs of 250 from each of the same four camps where a division 

 had been in training. This plan proved, however, largely impracticable. In some cases not 

 so large groups could be found, and in most cases it was necessary to go to different camps for 

 different arms and to more than four camps. An attempt was made, however, to keep a certain 

 amount of balance by offsetting a selection from a camp in which the scores were known to run 

 high by an additional selection from a camp where the men were inferior. The ultimate inclusion 

 of additional camps made it possible to increase the size of the main infantry group (rifle com- 

 panies) and the main artillery group (batteries) — the two organizations a comparison of which 

 is especially interesting. Two thousand cards were pulled for each of these groups. 



Table 7 gives the analysis of Group VIII. The separation is in accordance with divisional 

 Tables of Organization: Infantry into rifle companies, machine-gun companies, supply compa- 

 nies, and headquarters companies ; field artillery into batteries, trench mortar batteries, supply 

 companies, and headquarters companies; the letter companies of the engineers, the field signal 

 battalions, and the machine-gun battalions ; the trains into divisional military police, ammuni- 

 tion trains, supply trains, the ambulance companies of the sanitary train, and the field hospitals 

 of the sanitary train ; and the medical organizations into the medical detachments to be found 

 with line organizations. In addition to these organizations were added base hospitals trained 

 for overseas, base hospitals organized in camps in the United States, nurses, an officers training 

 camp group of 2,000, and a development battalion group of 2,000. 



Table 7. — Group VIII: White established organizations. 



Number of cases in Group VIII of principal sample. Table shows various organizations sampled, corresponding 

 code numbers (v. Hollerith code), and, in the last row, the total size of the samples. The number of cases stated 

 for the camps separately is approximate, not exact, since final sortings were not made by camps. They show, 

 however, the approximate constitution of the sample. 



