3IO BACTERIOLOGY 



/>'. No gas generated in glucose bouillon. 



1 . Produce indol ; no growth at 36 . 



14. Ps fimbriata (Wright). 



2. Do not produce indol ; grow at 36 . 



15. Ps. geniculata (Wright). 

 III. Colonies on gelatin erose, lobed, coli-like. 



16. Ps. delabens (Wright). 



6. Ps. coadunata (Wright) 



B. coadunatus Wright : I.e., 460. 



Morphology. Bacilli of medium size, ends rounded ; occur in pairs, filaments, 



and chains. A polar flagellum. 

 Gelatin colonies. In 3-4 days, round, brownish, dense, less than 1 mm. ; 



sunken in the liquefied gelatin ; microscopically, with brownish brownish 



gray centres, with rough, frayed margins and a zone of liquefied gelatin, 



in which are scattered granulations. 

 Gelatin stab. Liquefaction crateriform stratiform. 

 Agar slant. Growth translucent, grayish, slightly spreading. 

 Bouillon. Turbid, with a white sediment and a pellicle ; the medium has a 



slight greenish tint. 

 Potato. Growth brown, viscid, moist, glistening, spreading. 

 Milk. Coagulated, acid. No growth at 37 . Indol produced. Nitrates not 



reduced. 

 Habitat. Water. 



7. Ps. multistriata (Wright) 



B. multistriatus Wright : I.e., 462. 



Morphology. Bacilli of medium size, ends rounded, variable, in pairs. 

 Gelatin colonies. Deep : brownish, dense, granular, round-oval. Surface r 



round, grayish white, translucent, 1-2 mm. ; microscopically, with dark 



brownish dense centres, and thinner margins, with radiate brownish 



lines from the central nucleus. 

 Gelatin stab. In depth, growth beaded ; on the surface, growth irregular, 



whitish, gradually sinking into the liquefied gelatin, becoming, in 10 days, 



saccate. 

 Agar slant. Growth translucent, narrow. 



Potato. Growth grayish to creamy, thick, glistening, spreading, viscid. 

 Milk. Coagulated, amphoteric. Indol negative. No growth at 36 . Nitrates 



not reduced. 

 Habitat. Water. 



