BACTERIA OF THE COLON TYPE IN HUMAN INTESTINES 237 



as measured by ordinary methods. We have observed numerous 

 cases in which the reaction indicated an undoubted fermenta- 

 tion when so Httle gas was formed that it remained entirely dis- 



<is ■^s so s^ s.'^ se s.ff e.o e.^ e.'^ e.e es 7.0 7.^ z^^ 7^ 



•47 4S S./ 5-3 Se &iS S^ €y e.3 €^ €.7 €9 7./ 7^ 7.S 77 



7^ SO 

 7.9 <S/ 



Fig 1. The Fermentation of Glycerol Compared with that of Sucrose 



and dulcitol 



solved in the medium or appeared as a small bubble. The 

 results of the fermentation tests are summarized in table 3. 

 The methyl red test. This test was made in accordance with the 



