146 



PRINCIPLES .OF VETERINARY SURGERV 



symptomatic anthrax, black leg, quarter evil, and black quar- 

 ter. The bacillus is also known by the names of bacillus an- 

 thracis emphysematosa, Rauschbrand bacillus, and bacillus 

 Chauvasi. It was discovered by Arloing, Cornevin and 

 Thomas, between 1880-1883. 



Description. — Motile. Plagellated. Sporogenous. An- 

 aerobic. Aerogenic. Non-chromogenic. Liquefying, Path- 

 ogenic. Size, 3 /x to 5 /It long by 0.5 /« to 0.6 /* thick, It has 

 rounded ends and is never arranged in chains. It forms oval 

 spores which distend the bacillus at the point of formation. 



Fig. 17. 

 Bacillus Anthracis Symptomatici from Infected Tissues. 



When examined in the hanging drop the motility is readily 

 observed in the middle of the specimen, while those at the 

 edges die from their exposure to oxygen. 



Cultivation. — It is strictly anaerobic and therefore can 

 only be cultivated in sheltered environments. Deep stabs in 

 gelatin or agar-agar are the appropriate methods of growing 

 black leg bacillus. Liquid media — milk or bouillon — in a 

 vacuum or in hydrogen are also suitable. 



Staining. — It will not take Gram's, but can be colored by 



