144 DISEASES OF THE HOESE. 



pierced, and the canula remains as a tube, whereby the 

 water escapes. 



No. 6, is a straight trocar with canula, and is used in 

 diiferent sizes and for various purposes. Its first and 

 most important use is for piercing the rumen of cows and 

 oxen when attacked with hoven. Second, it is used occa- 

 sionally for piercing the horse, in cases of flatulent colic, 

 and in drawing off the fluid or serum accumulated in the 

 chest from disease of the lungs tnd pleura. Third, a small 

 size of this instrument is used in piercing the head of 

 sheep affected with hydatids. After the trocar has entered 

 the hydatid sack, the trocar is pulled out, the canula 

 remains, the point of a small and well-packed syringe is 

 placed in the head of the canula, and the suction-force 

 draws the fluid into the syringe, and the small cysts into 

 the canula — which can be caught and pulled out by means 

 of a pair of forceps. A trocar and canula should be kept 

 by every farmer who has a cow or an ox. 



Intestines. — Introsusception, or an entangling of the 

 intestines, sometimes takes place in horses, and proves fatal. 



Causes. Bowels empty, and the horse being driven fast. 



Symptom. When the horse comes in, he is observed to 

 be uneasy^-lying down, pawing with his feet, following 

 closely the symptoms of colic. The difficulty, or impossi- 

 bility of procuring relief, is only seen on examination, after 

 the horse is dead. (See Bowel Diseases.) 



Itch. — (See Mange and Skin Diseases.) 



Interfering. — This name is in use when speaking of 

 a horse hitting himself on the inside of the pastern joint, 

 either on the hind or fore leg. Sometimes it is called 

 cutting. It is usually done with the side of the opposite 

 foot. 



