GA 75
| No. | Lecture Title | Book Title | Date | City |
|---|---|---|---|---|
| 1. | Spiritual Science. Natural Science. Technology | Untranslated | 17 Jun 1920 | Stockholm |
| 2. | Philosophical Basis for Anthroposophy | Untranslated | 08 Jul 1920 | Bern |
| 3. | Science and Anthroposphy | Untranslated | 04 Jun 1921 | Weimar |
| 4. | Science Questions | Untranslated | 04 Jun 1921 | Weimar |
| 5. | Anthroposophy and Science | Untranslated | 02 Nov 1921 | Basel |
| 6. | Agnosticism in Science and Anthroposophy | Untranslated | 11 May 1922 | Leipzig |