MANUAL OF OATTLE-:E^EEI>I]SrG. 



221 



Average Diet— Rest. 





Carbonic acid 

 excixted. 



Grms. 



Oxygen taken 



up. 



G rais- 



E. 



G A.M. to G P.M , 



533 



es 



175 



6 P. JVI. to 6 A.M , 



379 



474 



58 



6 A.M. to 6 A.M:, 



912 



709 



94 



AYERiGE Diet—Work. 



6 A.M. to 6 P.M. 

 6 P.M. to G A.M. 



6 A.M. to G A.M. 



218 

 44 



98 



It will be observed that wbile in each ease more car- 

 bonic acid was excreted by day than by night, the larger 

 amount of oxygen was taken np during the night- More- 

 over, the numbers in the last column show that at least a 

 very considerable part of the carbonic acid excreted dur- 

 ing the day must have been formed at the cost of oxygen 

 ah-eady present in the body, since that taken up from the 

 air during the same time was far less than the amount 

 contained in the excreted carbonic acid. 



A comparison of the two experiments also shows that 

 of the increase of the carbonic acid excretion caused by 

 work (872.2 grammes), by far the larger part (351.6 

 grammes) occurred during the hours when the work was 

 performed, while the oxygen taken up during the same time 

 increased only 58.8 grammes, against 186.1 grammes in the 

 following night. 



