76 



INTRA VENOUS INECTION. 



second to the fourth fingers, in which case the ball of the 

 thumb rests on the mastoido-humeralis muscle, in a way that 

 the vein becomes filled above the point of compression in the 

 shorn area and stands out as a swollen cord. In the case 

 of flesh\- necked horses this compression is more readilj' 

 attained if the ht ad is somewhat elevated and extended by an 

 assistant. If the vein can not be made prominent in this 



Fig 3. Intravenous Injection. 



way the compression should be alternately applied and with- 

 drawn suddenly, the course of the vein then reveals itself by 

 a wave- like movement along the jugular groove. Just 

 above the point of compression the vein is the most fully 

 distended and firmly fixed. After testing the hypodermic 

 needle to see that it is open hold it between the second and 

 third fingers while the thumb covers its basal opening and 

 thrust it through the skin, cutaneous muscle and jugular 

 wall, in the direction of the vein obliquely forwards and up- 

 wards I to 2 cm. deep, so that the point of the needle enters 

 the vessel at its most distended part. In this way it is easy 

 to prevent injury to the median wall of the vein. If the 



