1. History and Historical Progress. I. THE ANCIENT WORLD. 2. Thales to Hippocrates: Before Psychology. 3. Plato: Before Psychology. 4. Aristotle: The Founding of Philosophical Psychology. 5. Theophrastus and Galen: The Hellenistic and Roman Periods. II. THE DARK AND MIDDLE AGES. 6. Plotinus and Augustine: The Patristic Period. 7. Aquinas: The Middle Ages, Rationalism and Faith. III. THE RENAISSANCE AND THE EARLY MODERN PERIOD. 8. Descartes: The Renaissance and the Beginning of the Modern Period. 9. Hobbes to Hume: British Empiricism. 10. Association and Mechanism: Two Wings of Empiricism. IV. THE MODERN ERA. 11. The Scottish Realists and the German Idealists: Two Reactions to Hume's Skepticism. 12. Helmholtz: The Physiological Substrate. 13. Fechner: Psychophysics. 14. Wilhelm Wundt: Introspection and Experiment. 15. Brentano and Ebbinghaus: Alternatives to Wundtian Orthodoxy. 16. Galton and Spencer: Developmentalism, Quantitativism, and Individual Differences. 17. American Psychology: Before William James. 18. William James and G. Stanley Hall: The Founding of Scientific Psychology in the United States. 19. Titchener and Structuralism: The Beginning of Experimental Psychology in America. 20. Angell and American Functionalism. 21. Utility in Psychology: The Rise of Applied Psychology. 22. John B. Watson and Behaviorism. 23. Wertheimer, Koffka, and Köhler: Gestalt Psychology. 24. Freud and Psychoanalysis. 25. Adler, Jung, and the Third-Generation Dynamic Psychologists. 26. European Psychologies of the Twentieth Century. 27. Psychology in the United States Since World War II.