Marcus Willaschek is Professor of Modern Philosophy at Johann Wolfgang Goethe-Universität Frankfurt. He is the author of Praktische Vernunft: Handlungstheorie und Moralbegründung bei Kant (1992) and Der Mentale Zugang Zur Welt: Realismus, Skeptizismus und Intentionalität (2003), and an editor of the three-volume Kant-Lexikon (2017).

Introduction; Part I. From Reason to Metaphysics: 1. Kant's conceptions of reason and metaphysics; 2. The logical use of reason and the logical maxim; 3. The supreme principle of pure reason; 4. Understanding the transition passage (A307-8/B364); 5. The transition from the logical maxim to the supreme principle of pure reason; Conclusion to Part I; Part II. The Other Side of the Transcendental Dialectic: 6. The system of transcendental ideas; 7. The paralogisms and antinomy arguments as 'necessary inferences of reason'; 8. Reason and metaphysics in the transcendental ideal and the appendix; 9. Transcendental realism and Kant's critique of speculative metaphysics; Conclusion to Part II.