ELEMENTS 



WATER BACTERIOLOGY 



WITH SPECIAL REFERENCE TO 



SANITARY WATER ANALYSIS. 



BY I . 



SAMUEL GATE PRESCOTT, 



Assistant Professor of Industrial Biology, 

 AND 



CHARLES-EDWARD AMORY WINSLOW, 



Assistant Professor of Sanitary Biology , 



IN THE 



Massachdsetts Institute of Technology. 



SECOND EDITION, REWRITTEN 

 FIRST THOUSAND. 



NEW YORK : 



JOHN WILEY & SONS. 



Xx)NDON: CHAPMAN & rfALL, Limited. 



X908. 



