MAKUAL OF CATTLE-FEEDING. 



235 



US plainly "botli the importanee of the process of evapora- 

 tion as a regulator of the vital heat, and the great waste of 

 fodder that niav be caused by an undue increase in tlie 

 perspiration. 



The regulation of tfie temperature of the body by the 

 perspiration, especially the sensible perspiration (sweat), is 

 too familiar to require more than a simple mention ; but 

 the effect of increased perspiration in augmenting the ex- 

 cretion of carbonic acid is of greater importance for our 

 present purpose. This effect is shown in these same ex- 

 periments by llenneberg. 



In the following table his results are arranged according 

 to the amount of carbonic acid excreted. The numbers 

 refer to the two animals taken together : 



Tempera- 



tnre of stalL 



Deg. Cent. 



9 3 



12 7 



14,1 



13.6 



13,7 



Hay fed. 

 G-rms. 



3,508 

 2,085 

 2,275 

 2,241 

 2,459 

 2,443 



WatfT drunk. 

 Grms. 



2,757 



(?) 

 3,103 



(?) 

 8,038 

 3,876 



Carbonic acid 



excreted. 



Grms. 



Water 



eyaporated, 



Grms. 



1,468 



1.238 



1,508 



1,578 



1,525 



1,601 



1,548 



1,680 



1,579 



1,7^0 



1,633 



1,650 



Tlnnm-j nitro- 

 gen. 

 Grms. 



14.81 

 15 42 

 16.91 

 15.59 

 15.56 

 16.02 



It is evident at once that in every case but the last an 

 increased evaporation of water and an increased excretion 

 of carbonic acid accompany each other ; but whether the 

 latter is a result of the former can be determined only 

 after the possible influence of all the other factors wiiich 

 influence the excretion of carbonic acid has been consid- 



