20 



MAX LEVINE 



TABLE 9 



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



IN DULCITOL 



Frequencies 



pig 0.92%, sheep 0.84%, human 0.83%, and horse 0.81%, as compared 

 with 0.72% normal acid for cow. The number of fermenting strains 

 from the different sources is too small for reliable comparison and 

 the differences here indicated are insignificant. 



Only 3 of the Voges-Prpskauer-positive strains ferment dulcitol, 

 but the amount of acid produced by each of these three organisms 

 is greater than that formed by any of the Voges-Proskauer-negative 

 strains. The mean for the Voges-Proskauer-positive organisms is 

 1.30%, and for the Voges-Proskauer-negative cultures 0.81% normal 

 acid. 



E. SALICIN 



Acid-production in salicin, as in glycerol, is not always accom- 

 panied by gas-formation. The frequency distribution with respect to 

 source, MacConkey type, and Voges-Proskauer reaction is indicated 

 in Table 10. 



