| 1. | Humanities, Natural Science, Technology | June 17, 1920 |
| 2. | Anthroposophy, Its Essence and Its Philosophical Foundations | July 8, 1920 |
| 3. | Natural Science and Anthroposophy | June 4, 1921 |
| 4. | Disputations on Scientific Questions | June 4, 19211 |
| 5. | Anthroposophy and Science | November 2, 1921 |
| 6. | Agnosticism in Science and Anthroposophy | May 11, 1922 |
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