626 



ROARING DYSPNCEA. 



left side. Mandl has since described the process of fatty 

 degeneration which occurs in these muscles as the result of 

 paralysis. The origin of the paralysis is usually an inflam- 

 matory attack, and the circumstance that the muscles on the 

 left side are usually affected has been explained by stating 

 that as these muscles are supplied with the recurrent nerve, 

 which, on the left side, passes off from the pneumogastric 

 further back than on the right, any inflammatory disease of 

 the cheat is more likely to affeci the left recurrent nerve, and 

 indirectly induce disease of the muscles to which it is dis- 

 tributed. 



VII. The deformities of the wind- 

 pipe, attended with roaring, are nume- 

 rous. The trachea may be distorted in 

 horses that have been used with a tight- 

 bearing rein, and an instance of this is 

 here figured. 



Constriction of the windpipe has fre- 

 quently been witnessed, and amongst 

 the most curious forms of this disease 

 we have cases in which the ends of the 

 cartilages curl in and divide the pas- 

 sage into two narrow tubes, through 

 which an insufficient amount of air 

 at last passes, and the animal dies of 

 suffocation. Tumours from the verte- 

 brae, and deposits such as those re- 

 Fig. H7. presented below, sometimes occasion 



roaring. 



The diagnosis of roaring demands a careful examination 

 of a horse through various paces, and chiefly in a gallop. An 

 enclosed space such as a riding-school is favourable for the 

 trial, and the precise seat of roaring may be made out by 



