PSYCHOLOGICAL MEASUREMENTS. 



581 



investigation. The second session, as with B, showed great improve- 

 ment over the first and the two squads came nearer to the same level. 

 The average for the next three sessions is low. From December 8 

 to the end of the experiment, A showed consistent improvement, with 

 relatively small changes from session to session. 



The reduced diet can not be considered as favoring better scores 

 than normal in the memory-span experiment. The decrease in the 

 last two sessions with B and the poor scores in the third and fifth 

 sessions for A seem in the direction of a low-diet effect. On the 

 other hand, B, with no assigned reason, except that they did not 

 receive so frequent practice as A, showed a marked decrease in the 

 third and fourth sessions. Had they at these points kept up their 



Squad A 

 Squad B 



5.0 L 



Fig. 106. — Average scores for memory span. 



level of November 3 and January 5, Squad A would by contrast have 

 made a poor record in the early part of the experiment, and B would 

 have appeared to decline in the second and third experiments with 

 food reduction. Our conclusions from the memory-span results can 

 not be positive on account of the apparently large normal fluctua- 

 tions in practice. It seems safest to beheve that the reduced diet 

 produced no certain change. 



THE INDIVIDUAL PSYCHOLOGICAL MEASUREMENTS. 

 (6) STRENGTH OF GRIP. 



It was the original plan in this investigation that strength and 

 endurance tests should be given to the members of the squads from time 

 to time in the gynanasium at Springfield. Circumstances over which 



