SUBCUTANEOUS INOCULATION OF ANIMALS 217 



animal by the skin of the neck, and 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,^ 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 consists of four pieces of. 

 heavy round wire so bent that two engage the animal 



Fig. 40 



Holder for larger animals. 



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 luie, 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, 



' A Simple, Humane Holder for Small Animals Under Experiment, 

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



