Preface xiii
Chronology xix
Bibliographical Abbreviations in Editorial Matter xxiii
Introduction xxv
1. Boolian Algebra-Elementary Explanations 1

CORRESPONDENCE COURSE ON THE ART OF REASONING
2. [Circular for Course on the Art of Reasoning] 10
3. [Follow-up Letter to Circular] 15
4. A Few Specimens of Exercises in the Art of Reasoning 19
5. Directions to Agents 21
6. [Letter to New Students] 33
7. [Orientation Letter to Marie Noble] 35
8. [Letter to Noble on the Nature of Reasoning] 37
9. [Reasoning Exercises: Number Series, Relational Graphs, and Card Games] 41
10. Boolian Algebra [Three Lessons] 50
11. [Two Letters from J. B. Loring on Algebra Lessons] 54
12. [Reply to Loring] 56
13. [Additional Exercises in Boolian Algebra] 58
14. [Science and Immortality] 61
15. Logical Machines 65

THE PEIRCE-GURNEY DISPUTE OVER
PHANTASMS OF THE LIVING
Cases Abstracted from Phantasms of the Living
16. Criticism on Phantasms of the Living: An Examination of an Argument of Messrs. Gurney, Myers, and Podmore 74
17. Remarks on Professor Peirce's Paper (by E. Gurney) 82
18. Mr. Peirce's Rejoinder 101
19. Remarks on Mr. Peirce's Rejoinder (by E. Gurney) 142
20. Number 155
21. Logic of Number 156

A GUESS AT THE RIDDLE
22. [Contents] 166
23. Chapter I. Trichotomy 168
24. [Chapter III.] The Triad in Metaphysics 181
25. Chapter IV. The Triad in Psychology 182
26. Chapter V. The Triad in Physiology 188
27. Chapter VI. The Triad in Biological Development 199
28. Chapter VII. The Triad in Physics 203
29. [Trichotomic] 211
30. Pendulum Observations at Fort Conger 216
31. Reflections on the Logic of Science 246
32. Note on the Analytical Representation of Space as a Section of a Higher Dimensional Space 260
33. Ordinal Geometry 263
34. [Mathematical Monads] 268
35. Review of Stock's Deductive Logic 271
36. Report on Gravity at the Smithsonian, Ann Arbor, Madison, and Cornell 275
37. [Reasoning] 354
38. On a Geometrical Notation 357
39. On the Numbers of Forms of Sets 360
40. The Formal Classification of Relations 363
41. Dual Relatives 368
42. Notes on Geometry of Plane Curves without Imaginaries 372
43. Review of Noel's The Science of Metrology 377
44. [Logic and Spiritualism] 380
45. Herbert Spencer's Philosophy 395
46. Review of Collins's Epitome of the Synthetic Philosophy 401
47. "Outsider" Wants More Light 402
Editorial Symbols 413
Annotations 417
Bibliography of Peirce's References 506
Chronological Catalog, January 1887-April 1890 512
Supplement to W5 Chronological List, 1884-1886 531
Essay on Editorial Theory and Method 534
Textual Apparatus 557
  Headnotes, Textual Notes, Emendations, Rejected
  Substantives, Alterations, Line-End Hyphenation
Line-End Hyphenation in the Edition Text 672
Index 673