138 ON RESPIRATION, 



from the lower jaw. Into this openhig a 

 leaden tube was introduced, which was kept in 

 its situation by a ligature round the neck. The 

 animal was instantly relieved, and respiration 

 was carried on entirely through this hole in the 

 trachea. " The tube was removed and cleaned 

 every day, and the horse appeared perfectly 

 easy in every respect for nearly three weeks, 

 until the ligature happening to get loose in the 

 night, the tube dropped out, and he was suffo- 

 cated. On dissection, it appeared that the 

 membrane lining the mouth of the windpipe 

 was so thickened, as to have entirely filled up 

 the cavity, and thereby prevented the air from 

 passing and repassing freely. 



As free respiration is the basis of health 

 and vigour, so will the contrary produce ge- 

 neral debility. Thus, the digestive powers of 

 the stomach being weaker in horses that are 

 broken winded, flatulency is produced, and the 

 air which is generated in the intestines makes 



its 



