THE CLASSIFICATION OF BACTERIA 255 



Agar slant. Growth pale yellow, spreading, becoming darker, pale chrome- 

 yellow to ochre-yellow. 

 Potato. Growth scanty, clay-yellow. 

 Habitat. Water. 



134. B. fluorescens Zimmerman 



B. fiuorescens-aureus Zimmerman : I.e., 24. 



Morphology. Bacilli 0.7 : 2.0 p. Optimum temperature 20 . 



Gelatin colonies. Deep: round, granular, light yellow. Surface: yellowish 



gray, thickest in the middle. 

 Gelatin stab. But slight growth in depth ; on the surface, a thin layer, which 



is yellowish and spreading. 

 Agar slant. Growth ochreous golden yellow. 

 Potato. As in agar slant. 

 Habitat. Water. 



135. B. flavus Adametz 



B. aureo-fiavus Kruse: Fliigge, Die Mikroorganismen, 1896, 310. 



Morphology. Bacilli 0.5 : 1.5-4 fi. Grow slowly at room temperatures. 

 Gelatin colonies. In eight days, small white points, becoming round, yellowish, 



opaque, 1-4 mm. 

 Gelatin stab. Slight growth in depth ; on the surface, small round colonies, 



crowded to make a dark chrome-yellow layer. 

 Potato. Convex colonies, becoming a chrome-yellow layer, becoming reddish 



brown in old cultures. 

 Habitat. Water. Surface of the body in eczema. (Tommasoli) Mon. prak. 



Dermatol., IX. 



136. B. aurantiacus Frankland 



Zeitsch. f. Hygiene, VI, 1889, 390. 



Morphology. Bacilli short, thick, variable, often in filaments. 



Gelatin colonies. Deep colonies : small, round, granular. Surface colonies : 



aerogenes-like, opaque, homogeneous, bright orange. 

 Gelatin stab. Slight growth in depth ; on the surface, growth glistening, 



orange. 

 Agar slant. Growth limited, orange. 

 Bouillon. Clear, with a thin pellicle, and orange sediment. 

 Potato. Growth thick, glistening, orange-red. Nitrates slowly reduced. 

 Habitat. Water. 



