54 BACTERIOLOGY 



ft Gelatine liquefied. 



Gas generated in glucose bouillon. 



PS. COADUNATA GROUP- 



No gas generated in glucose bouillon. 



Ps. Fairmontensis Group. 



* Produce pigment on gelatin or agar, 

 f Pigment yellowish. 



Gelatin liquefied. Ps. ochracea Group. 

 Gelatin not liquefied. Ps. turcosa Group. 

 ft Pigment blue-violet. 



Gelatin liquefied. Ps. janthina Group. 

 Gelatin not liquefied. Ps. Berolinensis Group. 

 ** Produce a greenish-bluish fluorescence in culture media. 

 f Gelatin liquefied. Ps. pyocyanea Group. 

 ft Gelatin not liquefied. Ps. syncyanea Group. 

 2. With endospores, aerobic and facultative anaerobic. 



a. Non-chromogenic. 



* Rods not swollen at sporulation. Ps. rosea Group. 

 ** Rods swollen at one end at sporulation. 



Ps. Tromelscalagel Group. 



b. Produce a greenish-bluish fluorescence in culture media. 



* Gelatin liquefied. Ps. viridescens Group. 

 ** Gelatin not liquefied. Ps. undulata Group. 



B. Do not grow in nurient gelatin or other organic media. 



Nitromonas Group. 

 II. Cell plasma with a reddish tint, also with sulphur granules. 



Chromatium Group. 



Microspira Migula 



I. Cultures show a bluish-silvery phosphorescence. 



Phosphorescent Group. 

 II. Cultures not phosphorescent. 



A. Gelatin liquefied. 



1 . Cultures show the nitro-indol reaction. 



a. Very pathogenic to pigeons. Msp. Metschnikovj Group. 



b. Not distinctly pathogenic to pigeons. Cholera Group. 



2. Nitro-indol reaction negative or very weak, at least after 24 hours. 



Cholera Nostras Group. 



B. Gelatin not liquefied or only slightly so. Msp. saprophila Group. 



