186 NUTRITIONAL PHYSIOLOGY 



Solving the equations we obtain the following (decimals 

 disregarded) : 



x = 69 90 grams of fat, heat value, 837 Calories. 



y = 103 227 " carbohydrate, " " 1054 



1891 " 



Thus we see that when the character of the metabolism is 

 known we can quite accurately predict the associated heat 

 production (indirect calorimetry), and when the heat pro- 

 duction and the excreta are known we can deduce equa- 

 tions to find the relative shares of fat and carbohydrate 

 in the general decomposition. 



