THE CLASSIFICATION OF BACTERIA 235 



Gelatin stab. Scanty growth in depth ; surface growth punctiform, becoming 



in 4-5 days spread over the entire surface ; liquefaction stratiform. 

 Agar slant. Growth of small, white, opaque colonies. 

 Bouillon. Turbid, with a membrane. 

 Potato. Growth thick, slightly spreading, pinkish. 

 Habitat. Isolated from saliva. 



76. B. hydrophilus Sanarelli 



B. hydrofhilus-fuscus Sanarelli : Centralblatt f. Bakteriologie, IX, 1891, 222. 



Morphology. Bacilli 0.6: 1.3/* — filaments. 



Gelatin colonies. Round, translucent. 



Agar slant. Growth bluish gray to brownish, thin. 



Bouillon. Turbid, with a slight membrane. 



Potato. Growth yellowish brown. 



Pathogenesis. Subcutaneous inoculation causes hemorrhagic septicaemia in 



frogs, salamanders, fish ; also in mice, guinea pigs, and rabbits. 

 Habitat. Isolated from water, and from frogs dead of septicaemia. 



77. B. pyogenes var. liquefaciens Lanz 



Centralblatt f. Bakteriologie, XIV, 1893, 269. 



Morphology. Bacilli 0.5-0.7 ^, of variable length. Cultures have a bad odor. 



Gelatin colonies. Not described. 



Gelatin stab. A fiinnel. 



Agar slant. Growth thin, whitish, glassy. 



Milk. Not coagulated. 



Potato. Growth citron-yellow, with gas bubbles. 



Pathogenesis. Intravenous inoculations of rabbits cause a multiple suppurative 



inflammation of the joints. 

 Habitat. Isolated from brain abscess after otitis-media. 



78. B. liquefaciens Frankland 



Microorganisms of Water, 1894, 461. 



Morphology. Bacilli short, rather thick ; ends rounded. 



Gelatin colonies. Round, entire, crateriform ; contents white, slimy. 



Gelatin stab. Liquefaction napiform ; sediment whitish, granular. 



Agar slant. A dirty white expansion. 



Potato. Growth light yellow. 



Habitat. Water. 



