Part I. Introduction: Phaenomenologia Iuxta Propria Principia.- Part II. Husserl on Psychologism and the A Priori.- Chapter 1. Metaphysical Hypostatization.- Chapter 2. A Question of Truth.

- Part III. Husserl on the Notion of A Priori before The Eidos.- Chapter 3. On the Way to the Eidos.- Chapter 4. The Doctrine of Ideality and the A Priori in the Logical Investigations.- Chapter 5. Essence, Idea, and the A Priori after the Logical Investigations.

- Part IV. On How to Apprehend the Ideal: Three Different Stages.- Chapter 6. Ideation, Attitude, Reduction.- Part V. Essence, Pure Essence, Eidos. The Doctrine of the A Priori in Ideas I.- Chapter 7.

Essence and Eidos.- Chapter 8. The Function of Eidetic Sciences.- Chapter 9. Τδε τ, Individuum, Region.- Part VI. Adventures and Misadventures of the Rationalität.- Chapter 10.

Rationalization.- Chapter 11. The Conflict Between Different Forms of Rationality.- Part VII. Formal and Material, Innate and Contingent A Priori.- Chapter 12. Formal and Material, Analytic and Synthetic A Priori.- Chapter 13.

From Formal to Innate--From Material to Contingent: The Development of the Concept of A Priori in Light of the Genetic Perspective.- Part VIII. Conclusion (Notes for Future Research).- Index.