GA 328
| Date | Title | City |
|---|---|---|
| 03 Feb 1919 | The Social Question I | Zürich |
| 05 Feb 1919 | The Social Question II | Zürich |
| 10 Feb 1919 | The Social Question III | Zürich |
| 12 Feb 1919 | The Social Question IV | Zürich |
| 25 Feb 1919 | The Social Question V | Zürich |
| 08 Mar 1919 | The Social Question VI | Zürich |