SUBCUTANEOUS INOCULATION OF ANIMALS. 213 



at the other end with another clamp that holds the tail 

 of the animal. This holder is shown in Fig. 39. For 

 larger animals the form of holder shown in Fig. 40 is 

 commonly used. 



The holder devised by Sweet, 1 which can be made of 

 any size, from that suitable to a guinea-pig up to that 

 large enough to secure a dog, is in every way the most 

 convenient that we have encountered and, from the 

 standpoint of the animal, is the most humane. It con- 



FlG. 40. 



Holder for larger animals. 



sists of four pieces of heavy round wire so bent that two 

 engage the animal immediately behind the lower jaw 

 while the remaining two close over the muzzle. All 

 are held in position by a single clamp controlled by a 

 single thumb-screw. When the screw is reversed and 

 the clamp opened the anterior and posterior wire of each 

 pair falls away from the median line, thereby liberating 

 the animal. To secure the animal it is placed upon its 

 back, the head laid in the cradle formed by the bent 

 wires, the latter are adjusted to the proper position, and 



1 Sweet : " A simple, humane holder for small animals under exper- 

 iment," University of Penna. Med. Bull., 1903, No. 2, p. 78. 



