572 MANUAL OF BACTERIOLOGY. 



formed and begun to manifest its action in the patient's 



body.* 



Bacillus Anthracis.— This is the largest of the pathogenic 

 bacteria with- the exception of the spirillum of relapsing fever, 

 which is longer but more slender. The bacillus of anthrax 

 is about 1.25 /^ broad, and from 3 to 10 m long. Bacillus 

 aerogenes capsulatus is of about the same size. The anthrax 

 bacillus often forms long threads. A capsule is sometimes 



cg^**** 



' u 



«^ 



Fig. 81. — Anthrax bacilli, showing spores. (X 1000.) 



present. It is not motile. It forms spores, which are placed 

 in the centers of the bacilli. The spores form only in the pres- 

 ence of oxygen; they do not appear in the body of an infected 

 animal during life. Anthrax spores are the most resistant of 

 all pathogenic bacteria; they have been known to withstand 

 boiling for more than half an hour f, 5 per cent, carbolic acid 



* Moschkowitz. Studies, Department Pathology. College Physicians and. 

 Surgeons. New York. Vol. VII. 1899^1900. Annals of Surgery, p. 442. 

 1900. 



fV. A. Moore. Injections Diseases of Animals 1906. 



