NON-PATHOGENIC BACTERIA. 269 



numbers of sarcinse may occur in the normal human stomach; 

 the presence of large numbers indicates the existence of ab- 

 normal fermentative processes. 



Bacillus Fluorescens Liquefaciens. — ^Found in water and 

 putrid fluids; very common; appears as a small rod, actively 

 motile; aerobic, but somewhat variably; liquefies gelatin; 

 grows rapidly at ordinary temperatures upon the usual cul- 

 ture-media. It forms a pigment having a beautiful greenish- 

 yellow fluorescence, best seen in transparent media; the 

 growth on potato has a brown color. Does not stain by Gram's 

 method and does not form spores. 



Bacillus Fluorescens Putidus. — ^Found in water; a short 

 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 cultures give 

 off a powerful, foul odor of trimethylamin. It produces a 

 greenish, fluorescent pigment, best seen in transparent 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 atmos- 

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

 in form often nearly like the micrococci; facultative anaerobic; 

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

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

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

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

 red color, which develops only in the presence of oxygen, ap- 



