Other intestinal Bacteria. 



163 



B. coli group, have received attention from the English 

 bacteriologists. A large number of species and races 

 have been described which are interihediate in their 

 properties between B. typhi and B. coli, all being non- 

 spore-forming, non-liquefying rods, which produce a 

 more or less characteristic growth on solid media. 

 Durham (1898) divided these forms into three main 

 divisions, grouped, respectively, about B. typhi, B. enteri- 

 tidis and B. coli. Organisms of the first division ferment 

 neither dextrose, lactose nor saccharose; those of the 

 second ferment dextrose but not lactose; and those of 

 the B. coli division form gas in both these, sugars. The 

 relationship of the commonest species is indicated in 

 tabular form below: 



BACTERIA OF THE COLON-TYPHOID GROUP. 



In the typhoid division, B. alcaligenes and B. dysen- 

 teriae are the best known forms, besides B. typhi itself. 



