SHERWOOD: DRINKING WATER ON TRAINS. 15 



the fermentation. As a rule, in about 90 per cent of the cases B. 

 coli will be found to be the active agent. Streptococcus pyogenes 

 was finally identified by its characteristic growth on blood agar. 

 As a general thing, only one sample was taken from each train, 

 and that was collected from the chair car next to the smoker. 



The results of the work done at Kansas City, Mo., and at 

 Wichita. Kan., are shown by the tables on pages 16, 17, and 18. 



