CHAP. VI.] 



PUS. 



247 



2. The amount of C0 2 contained in a purulent or sero-purulent 

 exudation increases with the age of the exudation. 



3. The amount of C0 2 contained in a purulent exudation 

 is small in proportion as the exudation approaches pure pus in its 

 characters. This is not only true of the total C0 2 , but particularly of 



