CONTENTS. XV 



PAGE 



Ehrlich's theory of the constitution of toxins — Antibacterial serum — 

 Lysogenic actions — Hfemolytic sera — Agglutination — Pfeiffer's phe- 

 nomenon — Therapeutic effects of anti-sera — Theories as to acquired 

 immunity — Ehrlich's side-chain theory — The theory of phagocytosis — 

 Natural immunity — Natural bactericidal powers — Natural susceptibility 

 to toxins 460 



APPENDIX A. 



Smallpox and Vaccination. 



Jennerian vaccination — Relationship of smallpox and cowpox — Bacteria in 



smallpox — Protozoa as causative agents — The nature of vaccination . 501 



APPENDIX B. 



Hydrophobia. 



Introductory — Pathology — The hydrophobic virus — Prophylaxis — Antirabic 



serum — Methods . 508 



APPENDIX C. 



Malarial Fever. 



Characters of the malarial parasite — ■ Varieties of the malarial parasite — The 

 cycle of the malarial parasite in man — The cycle in the mosquito — 

 Methods of examination . 516 



APPENDIX D. 



Amcebic Dysentery. 



Amoebic dysentery — Characters of the amoeba — Distribution of the amceba — 



Relations to disease — Methods of examination 529 



BIBLIOGRAPHY -534 



INDEX " • 553 



