342 



EXPERIMENTAL INOCULATION OF ANIMALS 



ii cm. high and n cm. in diameter, closed by a wire 

 gauze cover which is weighted with lead or fastened 

 to the mouth of the jar by a bayonet catch. A small 

 oblong label, 5 cm. by 2.5 cm., sand-blasted on the 

 side of the cylinder, is a very convenient device as 

 notes made upon this with an ordinary lead pencil 

 show up well and only require the use of a damp cloth 

 to remove them (Fig. 168). 



The rat is kept under observation in a glass jar simi- 

 lar, but larger, to that used for the mouse. 



FIG. 1 68. Mouse jar. 



FIG. 169. Tripod. 



A layer of sawdust at the bottom of the jar absorbs 

 any moisture and cotton- wool or paper shavings should 

 be provided for bedding. The food should consist of 

 bran and oats with an occasional feed of bread-and- 

 milk sop. 



The use of a metal tripod, on the platform of which 

 are soldered two small cups for the reception of the 

 food, inside the cage, prevents waste of food or its con- 

 tamination with excreta (Fig. 169). 



After use the jars and tripods are sterilised either by 

 chemical reagents or by autoclaving. 



The rabbit and the guinea-pig are confined in cages of 

 suitable size, made entirely of metal (Fig. 170). The 



