2006 ELEMENTS OF WATEK BACTERIOLOGY 



Kligler, therefore, defines B. aerogenes as saccharose- 

 positive salicin-positive (generally dulcite-negative) ; 

 B. communior as saccharose-positive salicin-negative 

 (generally dulcite-positive) ; B. communis as saccharose- 

 negative salicin-positive (generally dulcite-positive); 

 and B. acidi-lactici as saccharose-negative saHcin- 

 negative (generally dulcite-negative). B. cloacae may 

 be separated from B. aerogenes not only by the lique- 

 faction of gelatin, but by the failure to ferment glycerine. 



Kligler 's general summary of the relationships of 

 the dextrose fermenting bacteria is reproduced below: 



Since Rogers and his colleagues did not use salicin 

 in their tests, while Kligler did not determine the gas 

 ratio, it is uncertain how far their results correspond, 

 and it is to be hoped that their classifications may 

 soon be compared in detail by the simultaneous appli- 

 cation of both procedures. The fact that Rogers and 

 his associates find the high-ratio group characteristic 

 of milk but not of faeces, and their recent suggestion 

 (at the Jacksonville meeting of the A. P. H. A.) that 

 this high-ratio group is derived from grains and grasses 

 may prove of the greatest significance in sanitary water 

 analysis. 



