Study of the Morphology of Bacteria--Bacteriological Microscope--Hanging Drop Slides--Staining--Gram’s Method--Spores--Acid-fast Bacilli--Capsules-- Flagella--Metachromatic Granules 200 CHAPTER XX. Study of the Physiology of Bacteria--Temperature --Incubators--Thermal Death Point--Oxygen Relationships --Study of Physiological Activities--Appearance of Growth on Culture Media--Appearance of Molds on Plate Cultures 213 CHAPTER XXI. Animal Inoculation--Material for Bacteriological Examination 227 PART IV. GENERAL PATHOGENIC BACTERIOLOGY. CHAPTER XXII. Introduction--Infection--Acute Infection--Chronic Infection--Specific--Non-specific--Koch’s Postulates--Virulence--Susceptibility 231 CHAPTER XXIII. Pathogenic Bacteria Outside the Body--As Saprophytes--As Facultative Saprophytes--Latent--Carriers--Universal Carriers--Accidental Carriers--Necessary Intermediate Hosts 237 CHAPTER XXIV. Channels of Infection--Skin--Mucosæ--Respiratory Tract --Alimentary Tract--Mechanism of Entrance of Organisms --Dissemination in the Body--Paths of Elimination-- Specificity of Location 243 CHAPTER XXV. Immunity--Natural--Artificial--Active--Passive-- Production of Immunity--Vaccine--Antiserum--Practical Applications of Immunity Reactions 250 CHAPTER XXVI. Theories of Immunity--Pasteur--Chauveau--Baumgärtner --Metchnikoff--Ehrlich--Principles of Ehrlich’s Theory 256 CHAPTER XXVII. Ehrlich’s Theory (Continued)--Receptors of the First Order--Antitoxin--Antienzyme--Preparation of Antitoxins --Units 261 CHAPTER XXVIII. Ehrlich’s Theory (Continued)--Receptors of the Second Order--Agglutinins--Agglutination Reaction--Precipitins --Precipitin Test 265 CHAPTER XXIX. Ehrlich’s Theory (Continued)--Receptors of the Third Order--Cytolysins--Amboceptor--Complement--Anti-amboceptors --Antisnake Venoms--Failure of Cytolytic Serums in Practice--Complement-fixation Test 271 CHAPTER XXX. Phagocytosis--Opsonins--Opsonic Index--Bacterial Vaccines--Preparation of--Use of--Lipovaccines --Aggressins 280 CHAPTER XXXI. Anaphylaxis--Author’s Theory--Tuberculin Test--Table of Antigens and Antibodies--Summary of Immunity as Applied to Protection from Disease 289 BACTERIOLOGY. HISTORICAL INTRODUCTION.