158 BACTERIOLOGY. 



Cattle, the European races of sheep, goats, 

 and horses as well as deer and roe are very 

 susceptible to anthrax; the Algerian sheep 

 resist infection. Dogs develop a generalized 

 infection only after intravenous injection; with 

 subcutaneous injection, abscesses arise ; young 

 white rats are susceptible, older rats as a rule 

 develop only local abscesses, but septicaemia 

 may be produced by the injection of very large 

 numbers of bacilli. Common frogs and tree- 

 toads are refractory toward anthrax at room- 

 temperature, but succumb if the temperature 

 be raised ; the tree-toads are the more resist- 

 ant. Toads succumb at the room-tempera- 

 ture. Domestic fowls are resistant to anthrax, 

 but can be made susceptible by chilling, 

 and pigeons may be made susceptible by 

 hunger. 



Man is only relatively susceptible to the 

 disease and a local disturbance in the form of 

 a carbuncle always arises at the place of inocu- 

 lation ; when this is in the skin it takes the 

 form of a " malignant pustule " ; in the intes- 

 tine, that of an " intestinal mycosis." The 

 carbuncle may heal, or a generalized infection 

 or septicaemia may spread out from it. 



Infection of the lungs with anthrax occurs 

 in people who are engaged in the plucking 

 and sorting of wool. This form of anthrax is 



