I lii CARBON BALANCE 



the same amount of work as he performed bi becoming fatigu 



will i|(> bo at a much greater expenditure of energy. 



There is a diurnal variation in the respirato e, which is in 



genera] parallel with the body temperature; it rises during the day, 1 1 1 « - 

 time of activity and work, and falls during the night, the time 

 and sleep. Food also affects respiratory exchange, but it will V- nni 

 essary to go into this further after wha1 lias been said <>n ; 17. 



