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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