PATHOGENIC BACTERIA. 



275 



FlG 



It is pathogenic to mice and guinea-pigs, less so to rab- 

 bits; it is also pathogenic to sheep and cattle. Rats and 

 pigeons are quite resistant but not entirely immune; cats, 

 dogs and frogs are not sus- 

 ceptible, or but slightly so. 



Anthrax is a disease 

 which occurs chiefly in cat- 

 tle and sheep. It is com- 

 moner on the continent of 

 Europe and in Siberia than 

 in America. In susceptible 

 animals inoculated with 

 virulent cultures of the an- 

 thrax bacillus septicemia is 

 produced. Large numbers 



Of the bacilli are found in Colony of Anthrax bacilli (low power). 



FIG. 73. 



Bacillus of anthrax. Stick-culture in gelatin. (Giinther.) 



the blood, and may be crowded together in the capillaries 

 of the liver and kidneys. Men are occasionally affected, 

 24 



