ISOLATION OF SPECIFIC PATHOGENES. 57 



dysentery and diarrhoea, as shown by the decrease of 

 these diseases in Burlington, Vt. (Sedgwick, 1902), and 

 other communities where pure water-supplies have been 

 substituted for polluted ones. It is possible that the 

 examination of water for the B. dysenterise may in the 

 future help to throw important light on the sanitary con- 

 dition of a water. 



