BACTERIA PATHOGENIC FOR ANIMALS, NOT FOR MAN Ip7 



Synonym. Charbon symptomatique, Arloing, Cornevin, and 

 Thomas. 



Origin. This bacillus, described already in 1879, has been 

 isolated, and by animal inoculation shown to be the cause of 

 the "black-leg" or " quarter-evil " disease of cattle. 



Form. Large slender rods, which swell up at one end or in 

 the middle for the spore (Fig. 120). 



Properties. They are motile, and liquefy gelatin quite 

 rapidly. 



Fig. 120. Bacilli of symptomatic anthrax, with spores (x 1000) (Frankel 

 and Pfeiffer). 



A rancid odor is developed in the cultures. 



Cultures. The growth occurs slowly, and only in an atmo- 

 sphere of hydrogen, being very easily destroyed by oxygen 

 and carbon dioxid; grows best at 38 C.; under 15 C. no 

 growth. 



Glucose-gelatin. In a few days little round colonies develop, 

 which, under low power, show hairy processes around a compact 

 center. 



Stab-cultures in Full Test-tubes. The first growth in the 

 lower portion of the tube not very characteristic. Gases 

 develop after a few days, and the gelatin becomes liquid. 



