| The Value of Thinking I | September 8, 1915 |
| The Value of Thinking II | September 13, 1915 |
| The Value of Thinking III | September 14, 1915 |
| The Value of Thinking IV | September 14, 1915 |
| The Relationship Between Spiritual Science and Natural Science I | September 14, 1915 |
| The Relationship Between Spiritual Science and Natural Science II | September 14, 1915 |
| The Relationship Between Spiritual Science and Natural Science III | October 14, 1915 |
| The Relationship Between Spiritual Science and Natural Science IV | October 14, 1915 |
| The Relationship Between Spiritual Science and Natural Science V | October 14, 1915 |
| The Relationship Between Spiritual Science and Natural Science VI | October 14, 1915 |
| Episodic Observation On Space, Time, Movement | August 14, 1915 |
