60 PURE CULTURE OF BACTERIA 



useful in the case of nearly allied forms is that adopted 

 by the Society of American Bacteriologists. It is an 

 adaptation of the Dewey system of classifying books a 

 record of the characteristic features of the various organ- 

 isms being kept in accordance with the numerical system 

 given below. 



The registration of organisms in this manner would 

 greatly facilitate the comparison of most forms met with 

 in the course of research with those already known, and 

 it is hoped that some plan of this kind will be adopted 

 by all workers. 



Numerical System of recording the chief Characters 

 of a Bacterium. 



Group number. 



100. Endospores produced. 

 200. not produced. 



i o. Aerobic. 



20. Facultative anaerobic. 



30. Strictly anaerobic. 



1. Gelatine liquefied. 



2. not liquefied. 



.1 Acid and gas from glucose. 



.2 and no gas from 



.3 No acid from glucose. 



,4 No growth with 



.01 Acid and gas from lactose. 



.02 and no gas from 



.03 No acid from lactose. 



.04 No growth with 



.001 Acid and gas from saccharose. 



.002 and no gas from 



.003 No acid from 



.004 No growth with 



