THE CALL FOR OXYGEN 



Table 1 gives a summary of determinations of the metabolism 

 as expressed by the amount of oxygen actually used per unit 

 time and weight and at an outside temperature of 20°C. by 

 a small number of organisms selected for the purpose of illus- 

 tration. It shows, as one would expect, that size has a 



Table 1 



considerable influence upon the requirements, but is not 

 everything, since animals of the same weight may use very 

 different amounts. It indicates further a very large effect of 

 activity. We will try to analyse the factors influencing me- 

 tabolism one by one. 



The influence of size. By a study of dogs of different size, 

 the oxygen intakes of which were measured under comparable 



3 



