xii CONTENTS 



CHAPTER XXI. 



Animal Inoculation. 



Securing and Transporting Material from Animals for Bacterio- 

 logical Examination 225 



PART IV. 

 GENERAL PATHOGENIC BACTERIOLOGY. 



CHAPTER XXII. 



Introduction 227 



CHAPTER XXIII. 



Pathogenic Bacteria Outside the Body . . . 233 



CHAPTER XXIV. 



Paths of Entrance of Pathogenic Orgamisms, or Channels 

 OF Infection. 



The Skin 239 



Mucosae Directly Continuous with the Skin and Lined with 



Stratified Epithelium 240 



Lungs 241 



AUmentary Tract 242 



Mechanism of Entrance of Organisms 243 



Dissemination of Organisms 243 



Paths of Elimination of Pathogenic Microorganisms .... 243 



Specificity of Location of Infective Organisms 245 



CHAPTER XXV. 



Immunity. 

 Active Immunity 248 



CHAPTER XXVI. 

 Theories of Immunity 252 



