Chester's Synopsis of Groups of Bacteria 245 



work should have one. As Chester says, "probably nine- 

 tenths of the forms of bacteria already described might as 

 well be forgotten or given a respectful burial. This will then 

 leave comparatively few well-defined species to form the 

 nuclei of groups in one or another of which we shall be able 

 to place all new and sufficiently described forms." "That 

 typical forms or species of bacteria do exist, no one can deny. 

 These typical forms furthermore present certain definite 

 morphologic, biologic, cultural, and perhaps pathogenic 

 characters which establish the types independently of minor 

 variations. 



"The most marked of these types we select to become the 

 centers of groups, around which are gathered all related 

 species or varieties." "The division of the bacteria into 

 groups, so far as grouping was possible, is outlined in the fol- 

 lowing tables:" 



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 FER- 

 MENT GROUP. 



b. Gelatin liquefied. 



* Colonies on gelatin ameboid or proteus-like. BACT. 



RADIATUM GROUP. 



** Colonies on gelatin round, not ameboid. BACT. AM- 



BIGUUM GROUP. 

 II. Produce endospores. 



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



MOPHILIC GROUP. 



2. Grow at room temperatures. 



a. Gelatin liquefied. ANTHRAX GROUP. 



b. Gelatin not liquefied. BACT. F^CALIS GROUP. 



BACILLUS. 

 I. Without endospores. 



A. Aerobic and facultative anaerobic. 



