222 MANUAL OF BACTERIOLOGY. 



rod with rounded ends; actively motile; does not liquefy 

 gelatin; aerobic; does not form spores; grows rapidly at the 

 ordinary temperatures upon the common media. Gelatin cul- 

 tures give off a powerful, foul odor of trimethylamin. It 

 produces a greenish, fluorescent pigment, best seen in trans- 

 parent media; on potato the growths form a thin, gray to 

 brown, slimy layer. 



There are several other fluorescing bacilli, mostly found in 

 water. 



Bacillus Indicus. — Found by Koch in the stomach contents 

 of an ape in India; a fine short bacillus with rounded ends; 

 motile; does not form spores; facultative anaerobic; liquefies 

 gelatin; grows rapidly, best at 35° C. upon the ordinary media; 

 produces a brick-red pigment. Very large doses injected into 

 rabbits caused death in three to twenty-four hours. 



Bacillus prodigiosus. — Widely disseminated in the atmo- 

 sphere of certain places; a short bacillus with rounded ends, 

 in form often nearly Hke the micrococci; facultative anaerobic; 

 not motile, as a rule; does hot form spores; liquefies gelatin 

 rapidly; grows rapidly, best at 25° C. on the ordinary culture- 

 media; milk is coagulated; gas forms in sugar-media; cul- 

 tures on potatoes give off a foul odor of trimethylamin. A 

 brilliant red color, which develops only in the presence of 

 oxygen, appears in cultures. The pigment appears as granules 

 outside of the bacteria. 



Bacillus violaceus (of Berlin). — Found in water; a slim 

 rod with rounded ends which may form threads; actively 

 motile; facultative anaerobic; liquefies gelatin rapidly; forms 

 endogenous spores placed near the centers of the bacilli; grows 

 rapidly, and not at high temperatures, upon ordinary media, 

 forming a deep, violet-colored pigment. There are several 

 bacilli related to this one. 



Bacillus amylobacter (Clostridium butyricum; Bacillus 

 butyricus, Prazmowski). — Found widely distributed in nature 



