288 Biology in America 



Professor Chittenden, " there was a noticeable gain in self- 

 reliance and courage in their athletic work, both of which 

 are likewise indicative of an improved condition of the body. 

 How far these improvements are attributable to training and 

 to the more regular life the men were leading, and how far 

 to the change in diet, cannot be definitely determined. We 

 may venture the opinion, however, . . . that the change in 



A SOLDIER AFTER A SIX-MONTHS' DIET Low IN MEAT 



After Chittenden, "The Nutrition of Man." 



By permission of F. A. Stokes Company. 



diet was in a measure at least responsible for the increased 

 efficiency. As the writer has already expressed it, there must 

 be enough food to make good the daily waste of tissue, enough 

 food to furnish the energy of muscular contraction, but any 

 surplus over and above what is necessary to supply the^e 

 needs is not only a waste, but may prove an incubus, retard- 

 ing the smooth working of the machinery and detracting 

 from the power of the organism to do its best work." 



