164 BACTERIOLOGY 



1 08. Bact. arborescens (Frankland) 



B. arborescens Krankhind: Zeitsch. f. Hygiene, VI, 1889. 



Morphology. Bacilli 0.5 : 2.5 /u. filaments. 



Gelatin colonies. As above described, very characteristic; centre yellowish,. 



border iridescent. Medium liquefied slowly. 

 Gelatin stab. In depth, a turbidity of the medium ; on the surface, a thin, 



iridescent layer, later a yellowish sediment in the liquefied medium. 

 Agar slant and potato. Growth deep orange. Pigment insoluble in water, 



soluble in alcohol. 

 Bouillon. Turbid ; no membrane, and a yellowish sediment. Nitrates not 



reduced. 

 Milk. Not coagulated (Dyar). 

 Habitat. Water. 



109. Bact. oxylacticum (Dyar) 



B. oxylacticus Dyar : I.e., 369. 



Morphology . Bacilli 1. 0-1.3: 1.7-2.5 /*; occur singly and in chains. Gelatin 



liquefied quickly. 

 Potato. Growth glistening, transparent, watery, marked with opaque white 



"spots. 

 Agar slant. White, with a slightly ochreous tint. 

 Pepton-rosolic acid. Unchanged. Nitrates not reduced. 

 Habitat. From Krai's laboratory. 



no. Bact. desidiosum (Wright) 



B. desidiosus Wright : I.e., 443. 



Morphology. Bacilli small, short, rounded ; in pairs and clumps. 



Gelatin colonies. In 3 days yellowish brown irregular clumps, 1.0 mm., within 

 the surrounding liquefied gelatin ; microscopically, dense, granular, brown- 

 ish yellow, often darker in centre, irregular, and broken. 



Gelatin stab. Liquefaction fusiform, with a bubble at top. 



Agar slant. Growth brownish yellow, glistening, translucent, slightly spread- 

 ing. 



Potato. Growth brownish yellow, moist, elevated, rough. 



Litmus milk. Clot viscid, yellow, with a yellow-brown serum. Medium alka- 

 line amphoteric. 



Glucose bouillon. No gas. 



Indol. A slight or doubtful reaction. No growth at 36 C. 



Habitat. Water. 



