330 



A TEXTBOOK OF PHYSIOLOGY 



the above diet 15-625 grammes of protein and 28-275 grammes of 

 fat were retained per day in the organism. The energy exchange 

 can be obtained by deducting from the energy value of the food 

 eaten the amount of heat represented by these. 



Protein 

 Fat 



Calories. 



15-625x4-1= 64 (approximately) 

 28-275x9-3-263 



327 



Since 3,027-5 were supplied, the amount of energy liberated is, 

 therefore, 3,027-5-327 = 2,700-5 calories. 



Fia. 186. HORIZONTAL SECTION OF SELF-REGISTERING CALORIMETER FO:J EXPERI- 

 MENTS WITH SMALL ANIMALS. (A. V. Hill and A. M. Hill.) 



V, V, V, V, Vacuum between walls of a cylindrical Dewar's flask; A, incoming water 

 from tank; D, D, D, D, section of lead tubing around outside of flask; K, junction 

 between outer lead tubing and T-piece , ; E t and E. 2 , inlet and exit T-pieces 

 containing the thermopile T H, H, coil of lead tubing inside flask; B, exit pipe 

 for water; 0, self -registering galvanometer. 



Another indirect guide to the energy liberated by the tissues under 

 varying conditions is the amount of oxygen absorbed by them. This 

 is a good guide in successive comparative experiments, since, provided 

 the quality and relative proportion of the foodstuffs burnt are 





