CONTENTS XI 



CHAPTER XXVII. 



Ehrlich's Theory (Continued) — Receptors of the First Order — 

 Antitoxin — Antienzyme — Preparation of Antitoxins — Units . 238 



CHAPTER XXVIII. 



Ehrlich's Theory (Continued)^ — Receptors of the Second Order — 

 Agglutinins — Agglutination Reaction — Precipitins — Precipitin 

 Test ' 242 



CHAPTER XXIX. 



Ehrlich's Theory (Continued) — Receptors of the Third Order — 

 Cytolysins — Amboceptor — Complement — Anti-ambooeptors 

 — Antisnake Venoms — Failure of Cytolytic Serums in Practice — 

 Complement-fixation Test ... 248 



CHAPTER XXX. 



Phagocytosis — Opsonins — Opsonic Index — Bacterial Vaccines — 

 Preparation of — Use of — ^Aggressins . . 256 



CHAPTER XXXI. 

 Anaphylaxis — ^Author's Theory — ^Tuberculin Test — Summary . 264 



