CONTENTS 



PAGE 



INDRODUCTION ix 



CHAPTER I 

 THE BIOLOGY OF BACTERIA i 



CHAPTER II 

 BACTERIA IN WATER .......... 37 



CHAPTER III 

 BACTERIA IN THE AIR . . . 96 



CHAPTER IV 

 BACTERIA AND FERMENTATION in 



CHAPTER V 

 BACTERIA IN THE SOIL 137 



CHAPTER VI 

 BACTERIA IN MILK, MILK PRODUCTS, AND OTHER FOODS . . 178 



CHAPTER VII 

 THE QUESTION OF IMMUNITY AND ANTITOXINS 240 



CHAPTER VIII 

 BACTERIA AND DISEASE 264 



CHAPTER IX 

 DISINFECTION ........... 322 



APPENDIX 337 



