Part 4

§ 6. Establishment of the Doctrine of the Germ Origin of Disease 224

§ 7. Anaesthesia 235

§ 8. The Revolution in Surgery 237

§ 9. Some Modern Surgical Advances 243

§ 10. Bacteriology becomes a Special Science 249

§ 11. Some Important Bacteriological Results 253

§ 12. The Study of Immunity 259

§ 13. Some Practical Applications of Immunity 263

§ 14. The Conquest of the Tropics 271

(a) Yellow Fever 273

(b) Malaria 280

§ 15. The Changed View of Insanity 286

§ 16. The New Movement in Psychology 293

§ 17. The Revolution in Nursing 295

§ 18. Some Modern Physiological Concepts of Clinical Import 301

(a) Ductless Glands and Internal Secretions 302

(b) Nervous Integration 308

(c) Vitamins 311

§ 19. Knowledge of the Eye and its Disorders 313

§ 20. Investigation of the Nature and Action of Drugs 322

(a) Entry of Vegetable Drugs into the Pharmacopoeia 322

(b) Active Principles 323

(c) The Alkaloids 325

(d) The Glucosides 327

(e) The Study of Pharmacology 328

(f) Chemotherapy 329

§ 21. Interpretation of Collective Medical Data 333

EPILOGUE 351