- Bradley, F. H. (Francis Herbert), 1846-1924 (2)
- Locke, John, 1632-1704 (2)
- Haldane, R. B. Haldane (Richard Burdon Haldane), Viscount, 1856-1928 (1)
- Hodgson, Shadworth Hollway, 1832-1912 (1)
- Kemp, J. (1)
- Mill, John Stuart, 1806-1873 (1)
- Schopenhauer, Arthur, 1788-1860 (1)