BACILLUS-COLI-LlKE BACTERIA FROM FECES AND SEWAGE 21 



TABLE 10 



RELATION OF SOURCE, MACCONKEY TYPE, AND VOGES-PROSKAUER REACTION TO ACID-PRODUCTION 



IN SALICIN 



Inspection of Table 10 shows that the MacConkey types cannot be 

 differentiated on the basis of the amount of acid formed from salicin. 

 Neither is quantitative acid-production an index to the animal source. 

 The Voges-Proskauer-positive strains give more acid (1.28% normal) 

 than the Voges-Proskauer-negative strains (0.94% normal), but the 

 difference is not as marked or distinct as with sucrose and should not 

 be regarded as a differential index. 



RESUME 



A study of the quantities of acid formed by Bacillus-coli-like organ- 

 isms from different sources (pig, cow, sheep, horse, man, and sewage) 

 when they are inoculated into peptone water containing 1% of various 

 fermentable substances, indicates the following: 



1. The MacConkey types are indistinguishable on the basis of 

 quantitative acid-production in the fermentable carbohydrates, the 

 alcohols, and the glucosid studied. This is shown in Plot II, in which 



