GA 322
| Date | Title | City |
|---|---|---|
| 27 Sep 1920 | The Borders of Nature Knowledge I | Dornach |
| 28 Sep 1920 | The Borders of Nature Knowledge II | Dornach |
| 29 Sep 1920 | The Borders of Nature Knowledge III | Dornach |
| 30 Sep 1920 | The Borders of Nature Knowledge IV | Dornach |
| 01 Oct 1920 | The Borders of Nature Knowledge V | Dornach |
| 02 Oct 1920 | The Borders of Nature Knowledge VI | Dornach |
| 02 Oct 1920 | The Borders of Nature Knowledge VII | Dornach |
| 03 Oct 1920 | The Borders of Nature Knowledge VIII | Dornach |