CHARACTERS OF A BACTERIUM 



61 



Group number. 



.0001 Nitrates reduced with evolution of gas. 



.0002 not reduced. 



.0003 reduced without gas production. 



.0000 1 Fluorescent. 



.00002 Violet chromogen or colouring matter. 



.00003 Blue 



.00004 



.00005 



.00006 



.00007 



.00008 



.00009 



Green 



Yellow 

 Orange 

 Red 



Brown 



Pink 

 .00000 Non-chromogenic. 



The genus is indicated by a symbol or contracted 

 term preceding the number, e.g. 



Bacterium coli, Esch., is recorded thus : Back 222.1 1 1 10 

 Streptococcus lacticus, Kr., Sir. 222.22220 



Other features not included in the group numbers 

 may be dealt with in tabular form as shown below, the 

 presence or absence of a feature being indicated by a 

 plus ( + ) or minus ( - ) sign. For example, the 

 characters of 



