4IO PHYSIOLOGICAL CHEMISTRY. 



physical condition and good general health. For this reason 

 they deserve the fullest attention and study. It is the opinion 

 of the author of the experiments that increased food consump- 

 tion, so far from being necessary, is even in most cases a detri- 

 ment, since it calls for a large amount of extra internal work, 

 in the liver and kidneys especially, in metabolizing the diges- 

 tion products and in removing the waste. This is certainly a 

 consideration of some moment. How far these findings may 

 be applied to the case of men at hard work, in the open, in cold 

 weather remains to be tried. Chittenden's results are espe- 

 cially interesting with respect to the necessary nitrogen; but 

 for the hard-working man probably more fat and more carbo- 

 hydrate will always be found desirable. 



