276 BACTERIOLOGY 



Pathogenesis. By subcutaneous inoculations mice die in 4-12 days with symp- 

 toms of diarrhoea; bacilli in the blood. With rabbits there is elevated 

 temperature, and a portion die. Guinea pigs die in a proportion of the 

 inoculations. Inoculation of human teeth results in a gangrenous altera- 

 tion of the pulp. 



Habitat. Associated with gangrene of tooth pulp and caries of teeth, chronic 

 alveolar abscess, etc. 



191. B. aromaticus 



B. lactis No. 11 Fliigge : I.e. 

 Morphology . Bacilli slender. 

 Gelatin colonies. An irregular tangle of threads. 

 Gelatin stab. Show lateral outgrowths, slowly liquefied. 

 Agar slant and potato. Growth thick, leathery, channelled, becoming bright 



brown. 

 Milk. Coagulated, slowly peptonized, with an aromatic odor. 

 Habitat. Milk. 



192. B. magnus 



B. lactis No. 8 Fliigge : I.e. 

 Morphology. Bacilli large, thick. 

 Agar slant. Growth white, glistening. 

 Potato. Growth white yellow brown, crumpled. 

 Bouillon. Clear, with a pellicle. 

 Milk. Peptonized. 

 Habitat. Milk. 



193. B. Hueppei Trev. 



B. butyricm Hueppe: Miteillungen Kaiserlich. Gesundheitsamte, II, 1884, 309. 



Clostridium Hueppei Trevisan : Genera, 1889. 22. 



B. pseudo-butyricus Kruse: Fliigge, Die Mikroorganismen, 1896, 207. 



Agar slant. Growth whitish-bluish, smooth. 



Potato. Growth brownish, becoming crumpled. 



Lactose bouillon. No gas ; butyric acid produced. 



Milk. Coagulated, not acid, peptonized, with production of leucin, tyrosin, 



and ammonia. 

 Habitat. Milk. 



194. B. subtilis (Ehrenberg) Cohn 



Vibrio subtilis Ehrenberg: Infusionsthierchen als volkommene Organismen, Leipzig, 1838. 

 B. subtilis Cohn: Beitrage Biol., I, Heft 2, 1875. 



Morphology. Bacilli 1.2 : 3-4 ft filaments chains ; ends rounded. Spore 

 germination equatorial. Flagella peritrichic. Stain by Gram's method. 



