CONTENTS 



PAGE 



Indroduction ix 



CHAPTER I 

 The Biology of Bacteria i 



CHAPTER II 



Bacteria in Water . , . . . = . . 37 



CHAPTER HI 

 Bacteria in the Air ... 



CHAPTER IV 

 Bacteria and Fermentation iir 



CHAPTER V 

 Bacteria in the Soil i37 



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 



V 



