340 ANTHRAX 



on clinical grounds as anthrax are really such. A careful 

 bacteriological examination is here always advisable, especially 

 of any oedematous infiltration about the throat, or in the 

 neighbouring lymphatic glands ; often, in pigs dying of 

 anthrax, bacilli may not occur in the blood. Any hsemorrhagic 

 infarction in the spleen of a suspected animal should be carefully 

 investigated. The human subject may be said to occupy a 



FIG. 104. Portion of kidney of a guinea-pig dead of anthrax, 

 showing the bacilli in the capillaries, especially of the glomerulus. 

 Paraffin section : stained by Gram's method and Bismarck-brown. 

 x300. 



medium position between the highly susceptible and the rela- 

 tively immune animals. The white rat is highly immune to the 

 disease, while the brown rat is susceptible. Adult carnivora are 

 also very immune, and the birds and amphibia are in the same 

 position. 



With these differences in susceptibility there are also great 

 variations in the pathological effects produced in the natural or 

 artificial disease. This is especially the case when we consider 

 the distribution of the bacilli in the bodies of the less susceptible 



