SHERWOOD: DRINKING WATER ON TRAINS. 



19 



Altogether there were seventy-eight samples taken, and in 

 order to simplify matters these have been rearranged into four 

 groups according to the degree of pollution, beginning with the 

 worst samples in gi'oup I and ending with the purest water- in 

 group IV. 



Group I includes all those samples having at least 10 colon 

 organisms in 10 cc. of water, or 1 per cc. of the water examined, 

 and is as follows: 



GROUP I. 



Cnr. 



Kansa.-' City. Mo 



Wichita 



Wichita 



Wichita 



Wichit'i 



Name 



OF 



Raiiroad. 



Union Pacific . . . 

 A. T. 4S. F... 

 A. T. & S. P 



Enelew'd branch, 

 A. T.it ^i. F 

 Rock Island . 



Approxi- 

 mate 



numl.er 

 of B. oil 



in 10 cc. 



10 

 10 



10 

 10 

 10 



Group II includes those having from 6 to 8 B. coli in 10 cc. of 

 water : 



Group III: There are fourteen samples having from 1 to 4 B. 

 coli per 10 cc. of the water. In two of them both Streptococcus 

 pyogenes as well as B. coli was present. 



Group IV: There are forty-nine samples in which no B. coli 

 were present in 10 cc. of the water. 



In group I there are five samples, or 6.4 per cent, containing 

 10 colon bacteria in 10 cc. of the water, or 1 per cc, with bacterial 

 counts ranging from .500 to 1800 per cc. In one sample Bacillus 

 pyocijaneus, the green-pus organism, was found to be present. 

 Waters in this group are decidedly unfit for drinking purposes. 



In group II there are nine samples, or 11.4 per cent, in which 

 there are 6 to 8 colon organisms in each ten cc. of the water, with 



