72 



ROARING IN HORSES. 



wound, and intervene during the develop- 

 ment of more or less prominent growths. 

 These, moreover, are not frequent, and 

 there is more harm done than advantage 

 obtained by interfering directly with the 

 reparative tissue. The causes of inflam- 

 mation of the mucous membrane are the 

 opening of the external wound and the 

 introduction of irritating foreign bodies into 

 the larynx. In consequence it is better to 

 consider these points before meddling. 



5. Deformity of the Incised Cartilaginotts 

 Rings at the top of the Trachea. — This 

 consists in the lateral flattening of the 

 rings, and arises without doubt as a result 

 of the inflammation developed in their 

 substance. The transverse diameter of the 

 trachea may be reduced to the third of an 

 inch. The section of too many of the 



