WHAT IS PHYSICAL LIFE 



responding consumption of food material 

 in the body are regulated with astounding 

 exactitude in accordance with bodily re- 

 quirements. If, for instance, the body 

 consumes more proteid, it economizes a 

 quantity of fat and of carbohydrate equiv- 

 alent in energy value to the proteid, so 

 that from day to day the amount of energy 

 liberated in the body is very steady." In 

 other words, the body adjusts its chem- 

 istry just as it adjusts everything 

 else. 



The heat of the body is also kept up 

 by chemical processes, but for that pur- 

 pose more internal arrangements and ad- 

 justments to external conditions have to 

 be in incessant operation than in the case 

 of respiration. Even to enumerate them 

 would require many pages, and more 

 pages still to explain them. Thus the 

 human body maintains just the same tem- 

 perature, whether it be on the shores of 

 140 





