572 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



over his normal average. Two other subjects, Har and Liv, made 

 increases above 20, but on the average the improvement during the 

 3 weeks of the reduced diet was small, there being hardly any on Jan- 

 uary 13 and 19. 



The general averages for the two squads are plotted in figure 104. 

 The main interruption in the improvement shown by Squad A was on 

 January 12, as previously mentioned. Considering the points from 

 which the two squads start, each improved approximately the same 

 amount. The curves are regular and of the usual practice form. It 

 will be noted that Squad A, on their one normal date, were at a higher 

 level than Squad B, the difference being 10 points in favor of Squad A. 



Fig. 104. — Efficiency in the cancellation of specified number-groups. 



In the two succeeding experiments, however, which were during re- 

 duced diet, Squad A failed to maintain this advantage and improved 

 relatively slower than Squad B. During the low-diet period. Squad B 

 also made but a minor improvement, almost all of which was on the 

 last date. It appears, therefore, from the data at hand, that im- 

 provement in efficiency for quickly and accurately locating and can- 

 celling desired number combinations in heterogeneous material is not 

 favored by the condition of reduced diet. 



(4) ADDITION OF ONE-PLACE NUMBERS. 



In an adding experiment when a time limit is used and the units 

 in the task are as large as those employed here, that is, columns of 

 10 digits each, in which each column is added and the sum recorded 

 separately, it must inevitably happen that when the signal to stop 



