350 



EXPERIMENTAL INOCULATION OF ANIMALS 



cylinder, one end of which is turned over a ring of stout 

 copper wire, and from this open end a slot is cut ex- 

 tending about half way along one side of the cylinder. 

 The opposite end is closed by a "pull-off" cap and is 

 perforated around its edge by a row of ventilating holes, 

 which correspond with holes 

 cut in the rim of the cap. In 

 the event of the animal resist- 

 ing attempts to remove it from 

 the holder backwards, this cap 

 is taken off and the holder 

 placed on the table and the 

 guinea-pig allowed to walk out. 



To provide for different-sized 

 animals, two sizes of this holder 

 will be found useful : 



1. Length, 16 cm.; breadth, 6 

 cm. ; size of slot, 8 cm. by 2.5 cm. 



2. Length, 20 cm.; breadth, 

 8 cm.; size of slot, 10 cm. by 



2.5 cm. 



A convenient holder for mice and even small rats 

 is shown in figure 178, the tail being securely held by 

 the spring clip. Needless to say, the holder should 



FIG. 176. Taking guinea- 

 pig's temperature. 



FIG. 177. Voge's holder. 



be entirely of metal, and the wire cage detachable and 

 easily renewed. 



When the animal is anaesthetised, it is more conven- 

 ient to secure it firmly to some simple form of operat- 

 ing table, such as Tatin's (Fig. 179), which will accom- 



