THE BACILLUS OF SYMPTOMATIC ANTHRAX. 393 



tion is swollen and painful, and drops of bloody serum 

 may sometimes be seen exuding from it. At autopsy the 

 subcutaneous cellular tissues and underlying muscles 

 present a condition of emphysema and extreme oedema. 

 The oedematous fliiid is often blood-stained and the 

 muscles are of a blackish or blackish-brown color. 

 The lymphatic glands are markedly hypersemic. The 

 internal viscera present but little alteration visible to the 

 naked eye. In the blood stained serous fluid about the 

 point of inoculation short bacilli are present in large 

 numbers. These often present slight swellings at the 

 middle or near the end. They are not seen as threads 

 but lie singly in the tissues. Occasionally two will be seen 

 joined end to end. If the autopsy is made immediately 

 after death these organisms may not be detected in the 

 internal organs, but if not made until after a few hours 

 they will be found there also. In fresh autopsies 

 only vegetative forms of the organism may be found, 

 but later (in from twenty to twenty-four hours) spore- 

 bearing rods may be detected. (How does this compare 

 with the bacillus anthrads f) By successive inoculations 

 of susceptible animals with the serous fluid from the seat 

 of inoculation of the dead animal, the disease may be 

 reproduced. 



Cattle, sheep, goats, guinea-pigs, and mice are sus- 

 ceptible to infection with this organism, and present the 

 conditions above described ; whereas horses, asses, and 

 white rats present only local swelling at the site of in- 

 oculation. Swine, dogs, cats, rabbits, ducks, chickens, 

 and pigeons are, as a rule, naturally immune to the 

 disease. 



Though closely simulating the bacillus of malignant 

 oedema in many of its peculiarities, this organism can, 



