BACTERIOLOGY 



Gelatin stab. Liquefaction infundibuliform, an air space above ; sediment 



whitish-pinkish. 



Agar slant. Growth grayish, glistening, limited, translucent, brownish gray. 

 Bouillon. Turbid, flocculi in suspension, a slight pellicle, and a slight greenish 



tint to the medium. 



Potato. Growth thin, viscid, moist, glistening, brownish. 

 Litnms milk. Coagulated, decolorized, alkaline. Indol not produced. No 



growth at 35-36. 



Habitat. Water. 



1 6. Ps. delabens (Wright) 



B. delabens Wright : I.e., 456. 



Morphology. Bacilli small, short, and long forms. 



Gelatin colonies. Deep : round irregular, slightly granular, brownish yel- 

 low. Surface: thin, translucent, glistening, wavy irregular, centre 

 grayish ; microscopically, thin, translucent, marmorated, brownish centre ; 

 later the growth sinks in the slowly liquefied gelatin. 



Gelatin slant. Growth a gray white stripe which sinks into the gelatin. 



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

 growth thin, white, irregular, which sinks slowly into the liquefied 

 gelatin. 



Agar slant. Growth whitish, translucent, glistening, slightly spreading ; the 

 agar becomes greenish. 



Bouillon. Turbid ; a slight pellicle, and a slight greenish tint. 



Potato. Growth brownish, viscid, thick, spreading. . 



Litmus milk. Decolorized, not coagulated, alkaline ; a tough membrane^ 

 Indol slight. Nitrates not reduced. No growth at 36. 



Habitat. Water. 



CLASS III. WITHOUT ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. CHROMOGENIC, PIGMENT ON GELATIN OR AGAR. 



I. Pigment yellowish. 



A. Gelatin liquefied ; no gas in glucose bouillon. 



1. Milk coagulated. 



a. Grow well a? 35-36 C. 



17. Ps. pullulans (Wright). 



b. Do not grow at 35-36 C. 



1 8. Ps. annulata (Wright). 



2. Milk not coagulated. 



19. Ps. ochracea (Zimmerman). 



20. Ps. campestris (Pammel) Smith. 



