REMOVAL OF HYDATIDS. 



159 



end ; that is to say a cord is drawn tightly round the 

 neck, close to the shoulder, so as to stop the circulation 

 through the vein, and render it perceptible to the finger. 

 A lancet is the instrument generally used in bleeding, 

 though a well-pointed pen knife will do at a pinch. 

 The opening must always be made obliquely, in the 

 direction marked in the cut ; but before attempting 

 this, the animal must be secured, by placing it between 

 the operator's legs, with its croup against a wall. 

 The selected vein is then fixed by the fingers of the 

 operator's left hand, so as to prevent it rolling or slip- 

 ping before the lancet. Having fairly entered the 

 vein, the point of the instrument must be elevated, at 

 the same time that it is pushed a little forward, by 

 which motion it will be lifted from or cut its way out 

 of the vein. A prescribed quantity of blood should 

 never be drawn, for the simple reason that this can 

 never be precisely stated. If the symptoms are urgent, 

 as in all likelihood they will, your best plan is not to 

 stop the flow of blood till the animal fall or is about to 

 fall. When this occurs, run a pin through the edges 

 of the orifice, and finish by twisting round it a lock of 

 wool. 



(118.) Removal of Hydatids from within the head. 

 This animal, and the symptoms which it causes, I have 

 fully described at (169). Their removal has been 

 attempted in a variety of ways, but the simplest method, 

 and one most likely to succeed, is that followed in this 

 quarter. A couple of incisions, forming when com- 

 pleted the letter T, are made in the integument cover- 

 ing the soft part of the bone under which the hydatid 

 is supposed to be. Two flaps are in this way marked 



