Fisher — I'he Effect of Diet on Endurance. 37 



(June) My work from March to June was of a more confining 

 sort than ever before in the spring. From March to tlie Easter 

 recess I was occupied Avith library research ; from Easter on I 

 was engaged on an essay and the marking of some 260 Social 

 Conditions theses. On these last I spent considerably more 

 time and effort than in the preceding year. Thus ray work 

 was harder and more time-filling than usual. I had much less 

 out-door exercise than in- previous springs, and missed that 

 relaxation from efi'ort which all prior springtimes have bred. 

 Yet there was no feeling of overwork, or even of work as a 

 burden, till the first of June. From then on I did feel tired, 

 and examination time found me with a mind very difficult to 

 keep in harness. Undoubtedly I had over-pushed myself, but 

 did not realize it till June. . . 



R. (March) Felt an increase in efficienc3^ 



(June) My power for mental work was greater between the 

 March and June tests than between the January and March 

 tests and the latter was greater than before the experiment 

 began in January. I can state without hesitation that my 

 mental working power increased in consequence of " Fletcher- 

 izing." 



T. (March) Felt that he had at least held his own, but " surprised 

 to find that everj^ one of my tests (physical) had improved." 

 For the first test came after the rest and recreation of the 

 winter holidays when he " Avas in splendid condition. Since 

 then I have- had to work extremely hard with little regular 

 exercise and rarely in bed before about midnight." Surprised 

 also that the mental test showed no improvement, probably 

 because " the confusion around me was considerably greater 

 than in the first test." Can do his ordinary mental work 

 faster than before, though not sure that he can work longer. 

 (June) " I consider I did more work last year during the period 

 of the expei'iment than any other year. During the whole 

 nine months of the college year I was practically working up 

 to my limit of endurance. I did not grow sleepy as early 

 evenings as jarevious years and my attention was not as easily 

 distracted from my work as previous years. 



" The lack of improvement in the second mental test may 

 have been due largely to the fact that I was mentally fagged 

 out after the examinations and was feeling the need of ray 

 holidavs." 



