TABLE OF CONTENTS. 



CHAPTER I. 



THE BACTERIA IN NATURAL WATERS i 



CHAPTER II. 

 THE QUANTITATIVE BACTERIOLOGICAL EXAMINATION OF WATER . 25 



CHAPTER III. 



THE INTERPRETATION OF THE QUANTITATIVE BACTERIOLOGICAL 

 EXAMINATION 46 



CHAPTER IV. 



DETERMINATION OF THE NUMBER OF ORGANISMS DEVELOPING 

 AT THE BODY TEMPERATURE 57 



CHAPTER V. 

 THE ISOLATION OF SPECIFIC PATHOGENES FROM WATER ... 67 



CHAPTER VI. 

 METHODS FOR THE ISOLATION OF THE COLON BACILLUS ... 86 



CHAPTER VII. 

 SIGNIFICANCE OF THE PRESENCE OF B. COLI IN WATER ... 112 



CHAPTER VIII. 



PRESUMPTIVE TESTS FOR B. COLI 141 



xi 



