GA 325
| No. | Lecture Title | Book Title | Date | City |
|---|---|---|---|---|
| 1. | The Development of Thought from the 4th to the 19th Century I | European Spiritual Life in the 19th Century | 15 May 1921 | Dornach |
| 2. | The Development of Thought from the 4th to the 19th Century II | European Spiritual Life in the 19th Century | 16 May 1921 | Dornach |
| 3. | Natural Science and the World-Historical Development of Humanity since Ancient Times III | Untranslated | 21 May 1921 | Stuttgart |
| 4. | Natural Science and the World-Historical Development of Humanity since Ancient Times IV | Untranslated | 22 May 1921 | Stuttgart |
| 5. | Natural Science and the World-Historical Development of Humanity since Ancient Times V | Untranslated | 23 May 1921 | Stuttgart |
| 6. | Natural Science and the World-Historical Development of Humanity since Ancient Times VI | Untranslated | 24 May 1921 | Stuttgart |