602 



VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



to and including December 9. In the last 2 experiments there 

 was a definite, accumulative decline. This agrees very well with 

 the findings for the general averages of the same squad on the same 

 dates. It therefore appears that the eye-reaction time according to 

 the technique here employed was not changed in any significant way 

 by the reduced diet. According to the present standards our averages 

 and the variability values with the fluctuations in these are well within 

 normal limits. 



Tabi.e 169. — Squad A — Average of shortest eye reactions. 

 [Values in <r.] 



Table 170. — Squad B — Average of shortest eye reactions. 

 [Values in a.] 



(10) REACTION TIME FOR SPE.\KING 4-LETTER WORDS. 



When a list of 25 familiar 4-letter words is presented in chance order, 

 the reaction time for responding to such stimuli is approximately 

 twice that of the eye-reaction time.^ In tables 171 and 172 for 

 Squads A and B, respectively, the average reaction time, with the 

 standard deviation and the coefficient of variability, is recorded for 

 each subject and for each session. The word reactions were first 

 taken at the second experimental session with each squad, hence there 

 are no normal values for Squad A. There are 4 normal dates for Squad 



^As was shown by Dodge and Benedict, Carnegie Inst. Wash. Pub. No. 232, 1915, p. 100, there 

 is an instrumental latency with this exposure apparatus amounting to 37 a. The values which 

 have been entered in the tables are simply for comparative purposes, and this factor has not 

 been subtracted from them. The same is true of the published eye reaction data, where the 

 instrumental latency is 20 <r. (See footnote, p. 163.) 



