TABLE OF CONTENTS. 



CHAPTER I. 



PAQB 



The Bacteria in Natural Waters 3 



CHAPTER II. 

 The Quantitative Bacteriological Examination of Water 19 



CHAPTER HI. 



The Interpretation of the Quantitative Bacteriological 

 Analysis 35 



CHAPTER IV. 



Determination of the Number of Organisms Developing 

 at the Body Temperature 43 



CHAPTER V. 

 The Isolation of Specific Pathogenes from Water 49 



CHAPTER VI. 

 Methods for the Isolation of the Colon Bacillus 58 



CHAPTER VII. 

 Significance of the Presence of B. Coli in Water 74 



CHAPTER VIII. 



Presumptive Tests for B. Coli 94 



ix 



