524 VETERINARY LECTURES 



Fig. y). Sometimes the windpipe is slit open, and at others a piece about 

 the size of a shilling is removed, and the tube inserted. The tube has to 

 be removed and thoroughly cleaned two or three times a week. 



1102. Twitch. — This may be looked upon as a mechanical anaesthetic when 

 put on the tip of the nose and upper lip, or the ear. It has a wonderful 

 effect in keeping the horse quiet, and when used numerous minor opera- 

 tions can be performed without much trouble. The ordinary mode of 

 making a twitch is by boring a hole through the end of a piece of wood — 

 a portion of a stable-fork shank — about 18 to 24 inches long, putting 

 a piece of cord through the hole, and knotting the two ends together ; 

 the cord is then fixed on the upper lip and tip of the nose, and twisted 

 up to get a firm hold. 



