ROARING IN HORSES. 



during inspiration. The various alterations 

 which tend to create an obstacle to the 

 free circulation of air in the upper (superior) 

 respiratory passages are accompanied by 

 roaring. This is either acute or chronic, 

 according to whether it accompanies a recent 

 illness, when it may be transient ; or, on 

 the other hand, if it is the result of a 

 previous illness or injury, it is said to be 

 positive or chronic. 



Among the morbid conditions which give 

 rise to chronic roaring, there is one — 

 paralysis of the muscles of the larynx— the 

 extreme frequence of which has been re- 

 vealed during this century by anatomical 

 and pathological research. These inquiries 

 have established that 95 per cent, of the 

 cases of incurable roaring were due to 

 paralysis of the larynx. Total paralysis is 



