THE CLASSIFICATION OF BACTERIA 177 



Agar slant. A white, moist, glistening streak, which later becomes pinkish or 



flesh-colored. 

 Glucose bouillon. No gas. 

 Habitat. Associated with fire-blight of the pear and apple. 



145. Bact. rubidum (Eisenberg) 



B. rubidus Eisenberg : I.e.; Dyar: I.e., 568. 



Morphology. Bacilli 0.5-0.7 : 0.6-1.0 fi; occur singly and in short chains. 



Gelatin colonies. Round, slightly granular, reddish in centres ; gelatin lique- 

 fied slowly to rather quickly. 



Agar slant. Growth translucent, reddish brown, sometimes shading into 

 yellowish orange. 



Potato. Growth brownish red. 



Habitat. Air. 



146. Bact. ferrugineum (Dyar) 



B . ferrugineus Dyar: I.e., 375. 



Morphology. Bacilli 0.6: 1.0 /x; occur in pairs and chains. Growth red to 

 brick red, crusty, granular, scarcely wrinkled ; grow slowly. 



Gelatin colonies. Like round tufts of cotton. 



Milk. Not coagulated ; reaction unchanged ; a brick-red growth on the surface. 

 Nitrates not reduced. Lactose litmus blue. 



Habitat. Air. 



147. Bact. finitimum (Dyar) 



B . finitimus-ruber Dyar: I.e., 361. 



Morphology. Bacilli 0.5 : 0.6-1.0 ft ; occur singly and in chains of 3-4. 

 Gelatin colonies. Round, entire, smooth. Growth on solid media, pink to 



bright red. 

 Bouillon. No membrane. Nitrates not reduced. Lactose litmus blue. 

 Habitat. Air. 



148. Bact. ovatum (Bruyning) 



B. ruber-ovatus Bruyning : Archiv Neerland Sci. Exact, et Nat., Ser. II, 1898, 297. 



Morphology. Bacilli oval, 0.7-0.8 : 0.9-1.2 fi\ occur sometimes in pairs or 

 threes. Not stained by Gram's method. Indications of a capsule. Op- 

 timum temperature, 20 . 



Potato. Growth bright red to vermilion. 



Bouillon. Slight growth, becoming opalescent, with a scanty colorless sedi- 

 ment. 



Litmus gelatin. Unchanged. 



Habitat. Isolated from sorghum. 



N 



