96 EXPERIMENTS UPON ANIMALS. 



FIG. 35. 



Kitasato's mouse-holder. 



are grown on such media as have a tendency to increase their 

 virulence. The amount of material introduced should be in 

 proportion to the size of the animal. 



FIG. 36. 



Holder for larger animals. 



After inoculation the animal should be watched constantly 

 and a note made of any change in its condition. The tem- 

 perature is taken at regular intervals per rectum, with a spe- 



