Fisher — The Effect of Diet on Endurance. 



15 



in their college work. Besides the influence of overwork, there was 

 also present the influence of the season, — at least if the common 

 impression is correct that persons usually lose weight with the 

 approach of warm weather. 



Gymnasium tests were made at the beginning, middle and end of 

 the experiment. These tests were of two kinds, — tests of strength 

 and tests of endurance. The times of the tests were widely separated, 

 partly because those of endurance were too exhausting to be often 

 repeated, and partly because it was desired to avoid the influence of 

 "practice"; for not only does practice increase strength and en- 

 durance, but it also gives the users of the strength-registering 

 apparatus a facility or "knack" in manipulating it which produces 

 a false appearance of improvement. 



The dates of the three tests were January 14, a week after the end 

 of the Christmas vacation ; March 28, just before the Easter recess ; 

 and June 10, ' just before the summer vacation. 



Tests of strength, taken at the beginning, middle and end of the 

 experiment, show the following effects : 



R. Grip 



L. Grip 



i 



Date 



Jan. 14 



. Mch. 28 

 ( Jun. 16 



( Jan. 14 

 - Mch. 28 

 ( Jun. 16 



( Jan. 14 



Back Lift - Mch. 28 



/ Jun. 16 



Leg Lift 



Total 



( Jan. 14 

 - Mch. 28 

 ( Jun. 



( 



16 



Jan. 14 

 Mch. 28 

 Jun. 16 



TABLE X. 



STRENGTH TESTS (in lbs.) 



B E Lq Lw M 



100 135 95 98 145 



93 130 110 100 112 

 91 130 110 92 105 



94 115 82 112 107 

 82 115 110 100 105 

 75 115 97 105 105 



275 400 280 340 375 



260 440 375 380 275 



280 300 290 250 330 



520 600 370 400 460 



515 600 455 450 410 



400 545 440 445 400 



989 1250 827 950 1087 



950 1285 1050 1030 902 



846 1090 937 892 940 



P R T W Average 



95 132 120 125 116 



102 127 130 117 113 



103 125 121 115 110 



82 131 95 127 105 



70 115 106 111 102 



70 125 98 110 100 



250 360 370 365 335 



275 390 400 400 355 



265 345 330 364 306 



320 820 545 635 519 



415 865 570 650 548 



300 610 520 650 479 



747 1443 1130 1252 1075 



862 1497 1206 1278 1118 



738 1205 1069 1239 995 



In this table we see that during the first period there was a slight 

 increase in strength (from an average "total" strength of 1076 to 

 1118), and during the second period a slight fall to 995, which is 

 about \^io from the mid-year's 1118, and about 8^ from the original 



' But May 31 for E., Lw., R. and W., on account of earlier examinations than 

 the others, necessity to leave town, etc. 



