CHRONIC PLEURISY IN THP: HORSE. 209 



injections of pilocarpine, the chest not being bHstered. The animal 

 recovered. 



When the operation is properly performed the general health always 

 improves, breathing becoming easier and less frequent. The only 

 accident really to be feared when the operation has been slowly per- 

 formed is purulent change in the exudate, but this is avoided by 

 antiseptic precautions. In another patient affected with pleurisy 

 communicated from the lung, you noted on the third occasion of 

 tapping that the liquid was clearh' purulent, although on the second 

 occasion it had only been slightly turbid, and on the first had appeared 

 purely serous ; but cultivations from the liquid first obtained showed 

 pyogenic germs ; the exudate was then already purulent, a character- 

 istic which had simply become more accentuated. In this case tapping 

 could not be held responsible for the change in the exudate. 



Performed with proper precautions the operation is innocent. It is 

 always useful, and has been found of the greatest service in treating 

 obstinate cases of pleurisv. 



