INTRAVENOUS INJECTION 67 



compression should be alternately applied for a time and 

 then withdrawn suddenly when the course of the vein reveals 

 itself by a wave-like movement along the jugular groove. 

 In cattle, digital compression of the jugular is not always 

 efiScient in causing distension. It is more practical to dis- 

 tend the jugular by passing a looped cord around the base 

 of the neck and drawing it tightly. The very conical neck 

 of the cow tends to cause the cord to slip forward and loosen, 



Intravenous Injection 



which may be obviated by having an assistant grasp the 

 cord at the top of the neck and, drawing backward, hold it 

 in place. A very efficient method for distending the jugu- 

 lar of the cow is to stretch a strong cord tightly between 

 two posts at the height of the base of the neck, lead the 

 animal against it and secure the head firmly to a post in 

 front sufficiently tight to cause the lower part of the neck 

 to press firmly against the cord. 



