- Hume's Dialogues Concerning Natural Religion
- The Idea of God in the Light of Recent Philosophy
- The Spirit; the Relation of God and Man, Considered From the Standpoint of Recent Philosophy and Science
- The Development From Kant to Hegel: With Chapters on the Philosophy of Religion
- The Idea of Immortality: the Gifford Lectures Delivered in the University of Edinburgh in the Year 1922