THE CLASSIFICATION OF BACTERIA 251 



123 a. B. Rheni 



Rhine water Bacillus (Burri) : See Frankland, Microorganisms of Water, 1894, 483. 



Morphology. Bacilli 0.7 : 2.5-3.5 /u, ends rounded, sometimes slightly bent. 

 In bouillon long filaments and chains. Motility rotatory and progressive. 



Gelatin colonies. Deep colonies dirty yellow dots, round, entire, granular. 

 Surface colonies convex, colorless, transparent, becoming yellowish, with 

 an outer zone of clear liquid gelatin. Microscopically, the borders are 

 wavy, and contents rough and irregular. 



Gelatin stab. Growth scanty, in depth ; liquefaction shallow, funnel-formed ; 

 yellow flocculent masses in the liquefied gelatin, and a bluish gray opal- 

 escence on the surface of the still solid gelatin. 



Glycerin agar slant. Growth thin, glistening, dry, tough, honey-colored. 



Potato. Growth moist, glistening, thin, flat ; orange- or, rust-colored. 



Bouillon. Turbid, with a bright, orange-colored pellicle and a yellow deposit. 



Milk. Coagulated only partially in the upper part of the tube ; the cream 

 layer pale yellow ; serum alkaline. No growth at 37°. Nogas in glucose 

 bouillon. 



Habitat. Rhine River water. 



124. B. aurescens Ravenel 



I.e., 8. 



Morphology. Bacilli short, spindle-shaped, 2-3 times their breadth ; occur 

 singly. 



Gelatin colonies. Surface colonies minute whitish points, which are granular, 

 brownish, and entire. In 4 days 0.5 mm., yellowish brown, homogene- 

 ous, and entire. 



Gelatin stab. Slight growth in depth ; on the surface a yellow button ; in 18- 

 20 days a crateriform dry depression. 



Agar slant. Growth thin, yellowish, limited, beceming golden yellow. 



Potato. Growth yellow, thict, moist, spreading, becoming orange-yellow. 



Bouillon^ Slightly turbid, with a dense, flocculent sediment. 



Litmus milk. Reduced, no acid, not coagulated. Indol negative. 



Glucose bouillon. No gas. Grow at 36°. 



Habitat. Soil. 



125. B. cuticularis Tils 



Zeitsch. f. Hygiene, IX, 1890, 282. 

 Morphology. Bacilli 0.3-0.5 : 2.0-3.0 /«, — filaments. 



Gelatin colonies. Coli-like. The deep colonies are brown, irregular — entire ; 

 the surface colonies have brown centres and colorless borders. 



