172 BACTERIOLOGY 



134. Bact. fuscum (Zimmerman) 



B. fuscus Zimmerman: Bale. Trink u. Nutzwasser, 1890; Dyar, I.e., 361. 



Morphology. Bacilli 0.6 /x wide and of variable length. Optimum tempera- 

 ture 36' C. 



Gelatin colonies. Deep : round irregular, granular, grayish yellow brown. 

 Surface: punctiform, brownish yellow centre, lighter border. 



Agar slant. Growth crumpled, thick, chrome yellow. 



Potato. Growth chrome yellow, friable. 



Litmus milk. Blue. 



Nitrates not reduced. Bouillon. A membrane or pellicle. 



Pepton-rosolic acid. Unchanged. - Dyar. 



Habitat. Water. 



135. Bact. constrictum (Zimmerman) 



D. cotistrtctus Zimmerman : I.e. 



Morphology. Bacilli 07 : 1.5-6.5 /i; in chains. Grow only at room tempera- 

 tures. 

 Gelatin colonies. Small, glistening, Naples yellow, erose edges. 

 Agar slant and. potato. Growth yellow. 

 Habitat. Water. 



136. Bact. solare Lehmann-Neumann. 



Bak. Diagnostik, 1896, 258. 



Morphology. Bacilli 0.3-0.4 fi ; broad, short, and long filaments. 

 Gelatin colonies. Round, yellow, glistening, translucent ; microscopically, 



yellow, radially fibrous, borders filamentous. 

 Gelatin stab. Long, delicate outgrowths from the line of stab, yellowish. 



Growth on agar straw-yellow. 

 Potato. Growth soft, white, becoming yellowish. 

 Bouillon. Remains clear. No gas in glucose bouillon. 

 Milk. Unaltered. Indol negative \ W> negative. 

 Habitat. Water. 



137. Bact. breve (Frankland) 



No name Rinatoro-Mori : Zeitsch. f. Hygiene. IV, 1888, 53. 

 B. brev'n Frankland : Microorganisms of Water, 1894, 429. 



Morphology. Bacilli 0.8-1.0:2.5 \l\ show polar stain. Not stained by 



Gram's method. 

 Gelatin colonies. Grow very slowly at room temperature ; after 2-3 weeks, 



colonies very minute, pale yellow, compact. 



