Bibliography
- Modern Authors (1891)
- Approaches the Poor Scholar's Quest of a Mecca (1892)
- A Koran of Love (1894)
- Our Poets (1894)
- Religio Athletae (1895)
- Human Documents (1896)
- Prince Azreel (1911)
- Psychology; A New System (two vol.; 1912)
- Purpose and Evolution (1913)
- Sonnets of the Banner and the Star (1914)
- Ireland: Vital Hour (1915)
- Poppy Meadows, Roman Philosophique (1915)
- La Nouvelle Ethique (1917)
- L'Evolution dons ses Rapports avec l'ethique (1917)
- Moments of Genius (1919)
- The Immortal Caravel (1920)
- Moods of Life (1921)
- O'Rourke the Great (1921)
- Ethics, an Exposition of Principles (1922)
- Principles of Psychology (1923)
- Seraph Wings (1923)
- My Life Story (1924)
- Science, Leading and Misleading (1927)
- The Rosy Fingers (1929)
- The Case Against Einstein (1932)
