THE CLASSIFICATION OF BACTERIA 377 



Gelatin stab. On the surface a slimy white colony, umbilicate in centre ; 



gelatin slowly liquefied. 

 Potato. A broad band composed of confluent chalk-like colonies, with the 



odor of damp soil. The medium becomes blackish. 

 Bouillon. Turbid. In sterilized water an abundant cloudy growth. Grows 



in the absence of air. 

 Habitat. Water. 



8. Cladothrix fungiformis Ravenel 



I.e., 19. 



Morphology. Long chains and filaments with false branching, not always 

 easily made out. 



Gelatin colonies. Deep : radiately arborescent. Surface : white, minute, 

 which microscopically were densely floccose in the centre with gray, 

 radiately arborescent borders. In 7 days the colonies are mouldy and 

 sunken in the gelatin. Medium not discolored. 



Agar slant. Growth white, mouldy, adherent, becoming fissured, and show- 

 ing a dark brown substratum. Gives off a strong odor of rotten wood. 

 In 3-4 weeks the agar becomes slightly darker. 



Gelatin stab. In depth, growth arborescent ; on the surface, a white button, 

 under which a slow crateriform liquefaction takes place ; sides of crater 

 vertical. In 8 days the liquefaction has reached the sides of the tube. 

 There is no discoloration of the medium. 



Potato. A scanty, nearly colorless, streak ; potato distinctly whiter along 

 each border, becoming pale yellowish. 



Habitat. Soil. 



9. Cladothrix intrica Russell 



Morphology. On gelatin, long slender cells united into long filaments. On 

 potato, cells shorter with rounded ends, becoming segmented into short, 

 plump individuals containing spores. A false branching is seen in 

 gelatin cultures. 



Gelatin colonies. In 24-36 hours small white dull mould-like colonies which 

 rapidly liquefy the gelatin and which microscopically are floccose in centre 

 and filamentous at the border. 



Gelatin stab. In depth, growth arborescent; gelatin rapidly liquefied. 



Agar slant. Growth thin, dull, white, from which filaments extend into the 

 medium. 



Potato. Growth irregular, dull, white. 



Bouillon (made with sea water). An abundant friable sediment. 



Habitat. Isolated from sea water and sea mud. 



