IX 



Thus Table XV shows clearly with what irregularity 

 and dissimilarity 4 different strains of B. coli will reduce 

 the Va% glucose neutral red bouillon as Co.j and Co. 4 

 were not able to alter it at all. On the other hand 

 Table XVI shows, that in a normal neutral red bouillon, 

 both of these strains, as well as the other two, change 

 the colour from iron red to a bright canary yellow 

 within 24 hours. At the same time two of the strains 

 of B. typhosus (Ty. 2 and Ty. 4 ) are seen to produce an 

 orange colour. So though a colour contrast may be said 

 to exist, it is not a decided one. 



