GA 322
| No. | Lecture Title | Book Title | Date | City |
|---|---|---|---|---|
| 1. | Lecture I | The Boundaries of Natural Science | 27 Sep 1920 | Dornach |
| 2. | Lecture II | The Boundaries of Natural Science | 28 Sep 1920 | Dornach |
| 3. | Lecture III | The Boundaries of Natural Science | 29 Sep 1920 | Dornach |
| 4. | Lecture IV | The Boundaries of Natural Science | 30 Sep 1920 | Dornach |
| 5. | Lecture V | The Boundaries of Natural Science | 1 Oct 1920 | Dornach |
| 6. | Lecture VI | The Boundaries of Natural Science | 2 Oct 1920 | Dornach |
| 7. | Lecture VII | The Boundaries of Natural Science | 2 Oct 1920 | Dornach |
| 7. | Natural Science and Its Boundaries | Natural Science and Its Boundaries | 2 Oct 1920 | Dornach |
| 8. | Lecture VIII | The Boundaries of Natural Science | 3 Oct 1920 | Dornach |
| 8. | Paths to the Spirit in East and West | Natural Science and Its Boundaries | 3 Oct 1920 | Dornach |