340 



EXPERIMENTAL INOCULATION OF ANIMALS 



through the intestinal wall, and provokes the forma- 

 tion of small cysts in the immediately adjacent mesen- 

 tery. The presence of these cysts may give rise to 

 considerable speculation at the post-mortem. 



The Pigeon may be infected by H&mosporidia, and 

 its blood show the presence of halteridia. This bird 

 may also be the subject of a bacterial infection known 

 as pigeon diphtheria; while the fowl may be subject 

 to scabies and ringworm, or suffer from fowl cholera 

 or fowl septicaemia infections due to members of 

 the haemorrhagic septicaemia group. 



Weighing. The larger animals are most conveniently 

 weighed in a decimal scale provided with a metal cage 

 for their reception instead of the ordinary pan (Fig. 

 1 66). Mice and rats are weighed in a modification 



FIG. 166. Rabbit scales. 



of the letter balance, weighing to 250 grammes, which 

 has a conical wire cage, (carefully counterpoised) 

 substituted for its original pan (Fig. 167) . 



Temperature. To take the rectal temperature of 

 any of the laboratory animals, the animal should be 

 carefully and firmly held by an assistant. Introduce 

 the bulb of an ordinary clinical thermometer, well 

 greased with vaseline, just within the sphincter ani. 

 Allow it to remain in this position for a few seconds, 



