52 BACTERIOLOGY 



A PROPOSED SYNOPSIS OF GROUPS OF BACTERIA 



Bacterium 



I. Without endospores. 



A. Aerobic and facultative anaerobic. 



a. Gelatin not liquefied. 



* Decolorized by Gram's method. 



t Obligate aerobic. Acetic Ferment Group. 

 ft Aerobic and facultative anaerobic. 

 Gas generated in glucose bouillon. 

 Gas generated in lactose bouillon. 



Bact. aerogenes Group. 

 Little or no gas generated in lactose bouillon. 



Friedlander Group. 

 No gas generated in glucose bouillon. 

 Milk coagulated. Fowl Cholera Group. 

 Milk not coagulated. Swine Plague Group. 

 ** Stained by Gram's method. 



f Gas generated in glucose bouillon. Lactic Ferment Group. 



b. Gelatin liquefied. 



* Colonies on gelatin ameboid or proteus-like. 



Bact. radiatum Group. 

 ** Colonies on gelatin round, not ameboid. 



Bact. ambiguum Group. 



II. Produce endospores. 



1 . No growth at room temperature, or below 22-25 C. 



Thermophilic Group. 



2. Grow at room temperatures. 



a. Gelatin liquefied. Anthrax Group. 



b. Gelatin not liquefied. Bact. fjecalis Group. 



Bacillus 

 I. Without endospores. 



A. Aerobic and facultative anaerobic. 



a. Gelatin colonies roundish, not distinctly ameboid. 



* Gelatin not liquefied. 



f Decolorized by Gram's method. 



Gas generated in glucose bouillon. 

 Milk coagulated. Colon Group. 

 Milk not coagulated. Hog Cholera Group. 

 No gas generated in glucose bouillon. Typhoid Group. 



