76 ROARING IN HORSES. 



dead tissue, rapidly acquires great propor- 

 tions. The passage of the trachea may be 

 so reduced in six weeks that the finger 

 can only with difficulty be introduced. To 

 prevent this accident the india-rubber ampulla 

 should be but moderately filled, just suffi 

 ciently to close the trachea or use the tube 

 surrounded with gauze. 



7,. Persistent Cough and Rejection of Ali- 

 mentary Matter and Drinking Water throicgli 

 the Nasal Cavities. — These phenomena appear 

 generally about the fourth week. The cough 

 which mostly appears at the beginning, is 

 occasioned by the abnormal irritability of 

 the cicatricial tissues. As for the rejection 

 of food stuffs through the nasal cavities, 

 it results from the irregular cicatrisation of 

 the anterior portion of the arytenoidean 

 wound, producing an interference with the 



