160 BACTERIOLOGY 



Agar colonies. Star-shaped, with broad, radiating outgrowths. 

 Bouillon. Not turbid, with a membrane. 

 Agar slant. Growth grayish. 

 Potato. Raised dry colonies. 

 Habitat. Water. 



103. Bact. aquatilis (Zimmerman) 



B. radiatus-aquatilis Zimmerman : Bak. Nutz u. Trinkwasser, 1890. 



Morphology. 0.6: 1.2-2.5 /A. 



Gelatin colonies. Surrounded by a delicate " Strahlenkranz." 



Gelatin stab. A saccate liquefaction, with a pellicle on the surface ; medium 



turbid. 



Agar slant. Growth gray, translucent. 

 Potato. Growth yellowish. 



104. Bact. flexuosum (Wright) 



B. flexuosus Wright : I.e., 460. 



Morphology. Bacilli medium-sized, thick, rounded ; also chains and filaments. 

 Gelatin colonies. Deep: round oval, brownish, granular. Surface: in 2 



days, whitish irregular clumps. Microscopically, twisted strands, dense 



in centre, edge irregular. 

 Gelatin stab. A crateriform liquefaction, becoming stratiform ; medium 



alkaline. 

 Agar slant. Growth grayish, translucent, limited ; the agar becoming slightly 



greenish. 



Bouillon. Turbid, becoming slightly greenish. 

 Potato. Growth brownish, viscid, glistening, uneven. 

 Litmus milk. Coagulated, acid. Indol, a slight or doubtful reaction. Grow 



at 36. 



Glucose bouillon. Gas not produced. 

 Habitat. Water. 



105. Bact. ambiguum Chester 



Del. College Ag. Expt. Sta. Report, 1899. 



Morphology. On agar and potato, short rods and ovals to longer forms 3-4 

 times their breadth ; 0.7 : 1.0-3.0 //,. In neutral bouillon long filamentous 

 forms appear with often involution forms. Stain with ordinary analine 

 colors ; decolorized by Gram's method. Flagella absent. Aerobic, grow 

 only in open end of fermentation tube. Grow at 37 C. 



