BACILLUS CHAUVEI. 549 



In certain superficial respects this bacillus suggests, 

 as said above, bacterium anthracis, but differs from it in 

 so many important details that there is no excuse for 

 confounding the two. 



NOTE. From what has been said of this organism, 

 what are the most important differential points between 

 it and bacillus anthracis ? Inoculate several mice with 

 small portions of garden-earth and street-dust. Isolate 

 the organism that agrees most nearly with the descrip- 

 tion here given for the bacillus of malignant oedema. 

 Compare its morphological, biological, and pathogenic 

 peculiarities with those of bacillus anthracis under simi- 

 lar circumstances ; especially its action on animals and 

 its appearance in the tissues and fluids. 



Still another pathogenic organism that may be present 

 in the soil is 



BACILLUS CHAUVEI, ARLOING, CORNEVIN, AND 

 THOMAS, 1887. 



Synonyms : The bacillus of symptomatic anthrax Bacterie du char- 

 bon symptomatique (Fr.) Bacillus des rauschbrand (Ger.). 



It is the organism concerned in the production 

 of the disease of young cattle and sheep commonly 

 known as " black leg," " quarter evil/' and " quarter 

 ill," a disease that prevails in certain localities dur- 

 ing the warm months, and which is characterized by 

 a peculiar emphysematous swelling of the muscular 

 and subcutaneous cellular tissues over the quarters. 

 The muscles and cellular tissues at the points af- 

 fected are seen on section to be saturated with bloody 

 serum, and the muscles particularly are of a dark, 



