1. Familiar Letters about the Art of Reasoning
2. Ribot’s Psychology of Attention
3. Six Lectures of Hints toward a Theory of the Universe
5. [On Framing Philosophical Theories]
6. The Non-Euclidean Geometry Made Easy
7. Review of Jevons’s Pure Logic
8. Review of Carus’s Fundamental Problems
9. Review of Muir’s The Theory of Determinants
11. [Notes on the First Issue of the Monist]
13. Note on Pythagorean Triangles
14. Hints toward the Invention of a Scale-Table
15. Logical Studies of the Theory of Numbers
16. Promptuarium of Analytical Geometry
18. Boolian Algebra. First Lection
19. Notes on the Question on the Existence of an External World
20. [Note on Kant’s Refutation of Idealism]
THE MONIST METAPHYSICAL PROJECT
22. The Architecture of Theories [Initial Version]
23. The Architecture of Theories
24. The Doctrine of Necessity Examined
25. The Law of Mind [Early Try]
26. The Law of Mind [Excursus on the Idea of Time]
28. [Notes for “Man’s Glassy Essence”]
STUDIES ON THE ALGEBRA OF THE COPULA
31. [Deductions from a Definition of the Copula]
32. Algebra of the Copula [Version 1]
33. Algebra of the Copula [Version 2]
34. Examination of the Copula of Inclusion
35. On the Number of Dichotomous Divisions: A Problem in Permutations
36. Methods of Investigating the Constant of Space
38. [Morality and Church Creed]
39. Review of Spencer’s Essays
41. Review of Chambers’s Pictorial Astronomy
42. [Lesson in Necessary Reasoning]
45. The Non-Euclidean Geometry
46. The Sciences in Their Order of Generality
50. [Plan for a Scientific Dictionary]
52. [Why Do We Punish Criminals?]