208 BACTERIOLOGY 



Potato. Growth white to yellow ; gas produced. 



Milk. Coagulated in 1-2 days. 



Lactose bouillon. Gas. 



Saccharose bouillon. Gas. 



Pathogenesis. Intraperitoneal inoculations of 0.5-1.0 cc. of bouillon cultures 

 into mice cause death. With guinea pigs, subcutaneous inoculation 

 causes abscess formation ; intraperitoneal injections of larger doses cause 

 death. 



Habitat. Isolated from a case of angiocholitis and meningitis. 



7. B. toxigenus 



Bacillus of ice cream poisoning Vaughan-Perkins : Archiv f. Hygiene, XXVIII, 1896. 



Identical with B. coli, but milk coagulated more quickly, with strong butyric 

 acid odor. Grows on carrot ; growth elevated, creamy ; odor acid. {B^ 

 coli grows much less vigorously, and gives no odor.) 



Pathogenesis. Pathogenic to rabbits, cats, dogs, mice, and rats. 



Habitat. Isolated from poisonous ice cream. 



8. B. brassicae Lehmann-Conrad 



Lehmann-Neumann, Bak. Diag., 1896, 232. 



Morphological and cultural characters closely related to B. coli. Bacilli show 

 4-10 long slender flagella. Sometimes slightly colored by Gram's 

 method. Ferments milk, sugar. Milk coagulated. Generates in sauer- 

 kraut 80 per cent CO^, 18 per cent H, and 2 per cent CH^. 



Habitat. Isolated from sauer-kraut. 



9. B. icterogenes Kmse 



B. of yellow atrophy of the liver Guarnieri : Acad. Med. Rom., XIV, 1887-88, fasc. 8. 

 B. icterogenes Kruse: Flugge, Die Mikroorganismen, 1896, 372. 



Morphological and cultural characters like B. coli, but grow less vigorously. 

 Lactose bouillon. A small amount or no gas. No gas in saccharose bouillon. 

 Milk. Rendered slightly acid. 

 Pathogenesis. Intraperitoneal inoculations of guinea pigs cause septicaemia 



and degeneration of the liver. 

 Habitat. Isolated by Guarnieri from the liver and blood in acute yellow 



atrophy of the liver, and by Pasquale from typhoid stools. 



