GA 326
| Date | Title | City |
|---|---|---|
| 24 Dec 1922 | The Origins of Natural Science I | Dornach |
| 25 Dec 1922 | The Origins of Natural Science II | Dornach |
| 26 Dec 1922 | The Origins of Natural Science III | Dornach |
| 27 Dec 1922 | The Origins of Natural Science IV | Dornach |
| 28 Dec 1922 | The Origins of Natural Science V | Dornach |
| 01 Jan 1923 | The Origins of Natural Science VI | Dornach |
| 02 Jan 1923 | The Origins of Natural Science VII | Dornach |
| 03 Jan 1923 | The Origins of Natural Science VIII | Dornach |
| 06 Jan 1923 | The Origins of Natural Science IX | Dornach |