[ 



PASSING THE CATHETEK. 



655 



In castrating donkeys it is probably the best plan to ligature the 

 artery, which has a very rigid wall in these animals. 



Peritonitis (p. 114), bleeding (p. 114), scirrKous cord (p. 122), 

 and tetanus (p. 527) are the chief unfavourable results of cas- 

 tration. 



Catheter, Passing the. 



The male catheter is a long, flexible tube of somewhat smaller 

 diameter than the urethra (the canal by which the urine escapes 



Fig. 1 66. — Lifling up the horse's head when he is on the ground. 



from the bladder) and is used to draw off' the urine which the 

 animal is unable to discharge. It is provided with a whalebone 

 stillet to give it rigidity. 



The horse should be back-raked previous to the operation. If the 

 catheter is to be j^assed while he is standing up, his two hind legs 

 may be hobbled together, a fore leg held up, and a twitcb applied 

 to his upper lip. 



An assistant should draw out the head of the penis {glans penis) 

 from the sheath. If he finds difficulty in inserting his hand, he 

 should oil or grease the back of it. The operator, standing on the 

 right side of the animal, and having oiled the point of the catheter, 

 should introduce it carefully into the urethra (Fig. 141, p. 351), and 



