57 



exception of Subject K, the amount of energy was in all cases greater 

 than the standard, while that of protein equaled or exceeded it in live 

 cases. Judging the results of the studies in accordance with this 

 method of comparison, the amounts of protein and energy obtained 

 were on an average sufficient to maintain the subjects in equilibrium 

 with their environment. 



THE STRENGTH TESTS. 



At the beginning and end of each period of , examination the sub- 

 jects reported for strength tests, as has been noted. The sj'stem was 

 that devised b}' Dr. D. A. Sargent and now used in many colleges. 

 The individual taking the test is measured with a tape line and calipers. 

 He is then made to exert his strength upon a series of spring dynamom- 

 eters, the compression of which measures the strength of the various 

 muscles. The results obtained are tabulated and, by comparison with 

 a set of average results for men of the same age, the individual devel- 

 opment may be deduced. 



In the case of the men examined in this investigation the changes 

 observed were very small for the most part and are within the limit of 

 probable error in the method. A few of the more signiticant measure- 

 ments are given in the following table: 



T.\BLE 16. — Ages and physical measurements of mbjects. 



