332 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 /* long. Bacillus 

 aerogenes capsulatus is of about the same size. The anthrax 

 bacillus often forms long chreads. A capsule is sometimes 



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. Infectious Diseases 0} Animals 1906. 



