Foreword. Part I: Introduction: 1. Progress or Degeneration? 2. The Records, our Witnesses. 3. Lack of Change and Historical Explanation. 4. Our Odyssey. Part II: The Nineteenth: Century of History: 5. Historical Relationships. 6. Sound Change. 7. Historical Explanations. 8. Determinist Views of History. Part III: Grammars and Language Acquisition: 9. We Know More than we Learn. 10. The Nature of Grammars. 11. The Acquisition Problem: The Poverty of the Stimulus. 12. The Analytical Triplet. 13. Real-Time Acquisition of Grammars. Part IV: Gradualism and Catastrophes: 14. Grammars and Change. 15. Social Grammars. 16. Gradualism, Imagined and Real. 17. Catastrophes. 18. Competing Grammars. 19. The Spread of New Grammars. 20. Parametric Change. Part V: The Loss of Case and its Syntactic Effects: 21. Case. 22. Middle English Split Genitives. 23. Inherent Case and Thematic Roles in Early English. 24. The Loss and Origin of Case Systems. Part VI: Cue-Based Acquisition and Change in Grammars: 25. Models of Learnability. 26. Cue-Based Acquisition and Loss of Verb-Second. 27. V-to-I Raising and its Cue. 28. Creolization and Signed Languages. Part VII: Equilibrium and Small Punctuations: 29. Equilibrium. 30. English Auxiliary Verbs in the Eighteenth Century. 31. French chez. Part VIII: Historicism: The Use and Abuse of Clio: 32. Principles of History. 33. Clio Working through Biology. 34. Diachronic Reanalyses. 35. Trajectories. Part IX: The Evolution of the Language Faculty: 36. Bumpiness. 37. Explaining Evolution. 38. A UG Condition on Movement Traces. 39. The Condition is Maladaptive. 40. Conclusion. Part X: A Science of History: 41. Classical and Chaotic Views of Science. 43. History as an Epiphenomenon. References. Index.