256 BACTERIOLOGY 



137. B. flavescens Frankland 



No name Poh) : Ce/itralblatt f. Bakteriol., XI, 1892, 144. 

 B. Jlavescens Frankland : Microorganisms of Water, 1892, 448. 



Morphology. Bacilli 0.8 : 2.0 /x. Slightly motile. 



Gelatin colonies. Punctiform, yellow, granular. Grow very slowly. 



Gelatin stab. Grows in depth, and is spread over the entire surface. 



Agar stab. In depth, growth beaded, yellow ; on the surface, it spreads 



slowly. 

 Potato. Growth slimy, yellow, spreading. 

 Habitat. Isolated from marsh water. 



138. B. Winkleri 



B. mesentericus-aureus Winkler: Centralblatt f. Bakteriol., 2te Abt., V, 1899, 577. 



Morphology. Bacilli 0.7 : 2-3 p.. Actively motile. 



Wort gelatin colonies. In 24 hours, small, snow-white colonies, roundish, 

 sharp, lobate. Microscopically, cloudy, becoming vitreous drops, becom- 

 ing golden yellow, becoming slowly liquefied, with a concentric flocculent 

 zone; outside of this a zone of radiate outgrowths, and outside of this 

 again, and in the solid medium, are numerous secondary colonies. 



Gelatin colonies. Small, coarsely granular, with a central brownish nucleus 

 and an ameboid border. In 36 hours, colonies 0.25 mm. in diameter. 

 They are round, entire, with granular borders ; centres cloudy, and contain 

 long, spiral bacterial aggregates, or irregular aggregates variously placed. 



Potato. Growth thin, glistening, smooth, yellow. 



CLASS IX. WITHOUT ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. CHROMOGENIC, PIGMENT REDDISH. GELATIN 

 LIQUEFIED. 



I. Pigment bright carmine or fuchsin-red. 



A. On liquefied gelatin in stab cultures, the production of a membrane. 



1. Pigment carmine-red on agar and potato. 



139. B. piscatorus (Lehmann-Neumann). 



2. Pigment brick-red on agar and potato. 



140. B. indicus (Koch) Trevisan. 



B. No membrane on the liquefied gelatin in stab cultures. 

 I. Pigment granules in the rods. 



141. B. rubus Kruse. 



