EXPERIMENT WITH MAN. 



187 



explained. These corrections are chiefly of importance from their bear- 

 ing upon the question of heat production versus heat elimination, and 

 they are accordingly omitted from the present brief summary. 



INTAKE AND OUTPUT OF MATERIAL, AND ENERGY. 



From the data derived from the preceding tables the balance between 

 the intake and output of material and energy in the body may be cal- 

 culated. The methods and results of these calculations may be explained 

 as follows : 



GAINS AND LOSSES OF BODY MATERIAL. 



In order to compute the gains and losses of body material as expressed 

 in terms of protein, fat, and carbohydrates it is necessary first to deter- 

 mine the gains and losses of the elements which make up these com- 

 pounds. This is done by comparing the amounts of the elements in 

 the intake of the body with those of the output, as shown in Table 12. 



12. Gain or Loss of Body Material, Metabolism Experiment No. 70. 



The intake of the body is made up of the following: (i) Oxygen 

 from the air, which is found for this experiment in column (<?) of Table 

 10 ; (2) water in drink, which is taken from the record of the amount 



