12 



TABLE III. RELATIONSHIP BETWEEN QAUNTITATIVE ACID-PRODUCTION 

 AND GAS-FORMATION BY COLON GROUP. 



It will be noted that acid-production in sucrose, dulcitol, and raffinose 

 is well correlated with the presence or absence of gas. With salicin the 

 correlation is not so marked, while with glycerol the line of demarcation 

 between gas-formers and non-gas-formers, as indicated by the quantity of 

 acid produced, is very indistinct. The substitution of quantitative acid- 

 production for gas-formation would therefore be particularly undesirable 

 when working with glycerol. 



