THE CLASSIFICATION OF BACTERIA 239 



91. B. nitrificans Burri-Stutzer 



Centralblatt f. Bakteriol., I, 1895, ate Abt., 735. 



Morphology. Bacilli 0.5 : 0.7-1 .5 /x ; involution forms ; stain badly in aqueous 

 analine colors. 



Gelatin colonies. Deep colonies : round, gray. Surface : round, slimy, color- 

 less, which after 8 days are sunken in the liquefied gelatin. 



Gelatin stab. Surface growth spreading, colorless to bluish, 2-3 mm., which 

 after a time begins to sink in the liquefied gelatin. In 3 weeks a crateri- 

 form to napiform liquefaction. 



Bouillon. Slightly turbid, with a small amount of a whitish to reddish sedi- 

 ment. Oxidizes nitrites to nitrates. 



Habitat. Isolated from the soil. 



92. B. guttatus Zimmerman 



Bak. Trink u. Nutzwasser, Chemnitz, 1890, 56. 



Morphology. Bacilli 0.9 : 1 .0 fx. 



Gelatin colonies. Deep colonies have a brownish centre and bright borders. 



Surface colonies are small and round. 

 Agar slant. Growth gray, limited. 

 Potato. Growth slimy, yellowish gray. 

 Habitat. Water. 



93. B. inunctus Pohl 



Centralblatt f. Bakteriol., XI, 1892, 143. 



Morphology. Bacilli 0.8-0.9: 3.5 (i. 



Gelatin colonies. Round, entire. 



Gelatin stab. Radiating outgrowths from the line of stab ; surface growth 



thick, glistening. 

 Agar slant. Growth whitish. 

 Potato. Growth slimy. 

 Habitat. Water. 



94. B. litoralis Russell 



Zeitsch. f. Hygiene, XI, 1891. 



Morphology. Bacilli 2-4 times their breadth ; grow slowly. 



Gelatin colonies. The deep colonies in 3 days are small, brownish ; the sur- 

 face colonies are entire, shining to opalescent, and granular ; liquefaction 

 takes place in 5-8 days. The evaporation causes depressed colonies. 



