1. Appearance and Reality
2. The Existence or Matter
3. The Nature of Matter
4. Idealism
5. Knowledge by Acquaintance and Knowledge by Description
6. On Induction
7. On  Our Knowledge of General Principles
8. How a priori Knowledge is possible
9. The World of Universals
10. On Our Knowledge of Universals
11. On Intuitive Knowledge
12. Truth and Falsehood
13. Knowledge, Error, And Probable Opinion
14. The Limits of Philosophical Knowledge
15. The Value of Philosophy