TIIK. BACILLUS OF \\TIM;\X. 



r<ll.ho<J<>iwix. The anthrax hacillus is pat hogenic for cattle, 

 sheep, horses, rahhits, guinea-pigs, ami mice. White rats, dogs, and 

 frogs are immune, as is also the Algerian race of sheep. The spar- 

 row is suseepfihle to general infection, hut chickens, under normal 

 conditions, aw not. Young animals a. re, as a rule, more susceptihle 

 tliaii adults of the same species. Man does not hclong among the 

 most, susceptihle animals, hut is suhjecf to local infection as a, result 

 of accidental inoculation malignant pustule and to pulmonic an- 

 thrax from hrcathing air, containing spores of the anthrax hacillus, 

 (I iii-ing the sorting of wool or hair from infected animals. In animals 

 which have a, partial immunity, natural or acquired, as a result, of 

 inoculations with attenuated virus, the suhcutaneous introduction of 

 virulent cultures may give rise to a limited local inflammatory pro- 

 cess, with effusion of hloody serum in which the hacillus is found in 

 considerable numbers ; but the blood is not invaded, ami the animal, 

 after some slight symptoms of indisposition, recovers. In susceptihle 



I i<;. Ktt. -HacilluH unthracitf In liver of mouse. X 700. (Fl&KKtJ.) 



animaJs injections henea.tli the skin or into a vein tfive risc^ to general 

 infection, and the bacilli multiply rapidly in the circulating fluid. 

 Death occurs in mice within twenty-four hours, and in rabbits, as a 

 rule, in less than forty-eight hours. The blood of the heart and 

 large vessels maybe found, in an autopsy made immediately after 

 death, to contain mmparatively few ha.cilli ; hut in the capillaries of 



the various organs, and especially in the great I y enlarged spleen, in 

 the liver, the kidneys, and the lungs, they will he found in great 

 numbers, and well t;iined sections of these organs will give an as- 

 tonishing picture under the microscope, which the student should not 

 fail to see in preparations made by himself. The capillaries in many 

 places will he found stulTed full of ha.cilli ; or they may even he nip- 



