RESPIRA TION 



141 



The following table is taken from the experiments of Zuntz 

 and Lehmann on horses :* 



The following table presented by Colin gives a general view of 

 the respiratory changes in animals. It represents the mean of 

 observations made many years ago by different authorities. 



The column showing the respiratory changes per kilo of body 

 weight illustrates the fact, to which attention will subsequently 

 be drawn, that the changes among small animals are greater 

 than among large ones, owing to their greater body surface rela- 

 tively to their weight. The discharge of carbon dioxide by a 

 mouse, for example, is relatively sixteen or seventeen times 

 greater than that of an ox. 



* The work performed in these experiments was carried out on a plat- 

 form revolving at different speeds, and the animal was thus kept in con 



