56 Elements of Water Bacteriology. 



bacteria per c.c. in the water from the taps, while a well 

 in the infected district gave 6100. It was no surprise 

 to find, on a further study of the epidemic, that the well 

 was largely at fault and the public supply was not. 



In the case of ground-water the evidence is usually even 

 more distinct. At Framingham, Mass., in 1903, high 

 chlorin content in the public supply, drawn from a filter 

 gallery beside a lake, had led to public anxiety. Five 

 samples from different parts of the system showed averages 

 of i, 2, 2, 2, and 4 bacteria per c.c.; and taking this in 

 conjunction with the other features of the bacteriological 

 analysis, it was possible to report that any pollution 

 introduced upon the gathering ground had at the time of 

 examination been entirely removed. 



