GA 326
| No. | Lecture Title | Book Title | Date | City | 1. | Lecture I | The Origins of Natural Science | 24 Dec 1922 | Dornach | 2. | Lecture II | The Origins of Natural Science | 25 Dec 1922 | Dornach | 3. | Lecture III | The Origins of Natural Science | 26 Dec 1922 | Dornach | 4. | Lecture IV | The Origins of Natural Science | 27 Dec 1922 | Dornach | 9. | Lecture IX | The Origins of Natural Science | 6 Jan 1923 | Dornach | 5. | Lecture V | The Origins of Natural Science | 28 Dec 1922 | Dornach | 6. | Lecture VI | The Origins of Natural Science | 1 Jan 1923 | Dornach | 7. | Lecture VII | The Origins of Natural Science | 2 Jan 1923 | Dornach | 8. | Lecture VIII | The Origins of Natural Science | 3 Jan 1923 | Dornach |
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