- The Philosophy Of Law: A Course Of Lectures Delivered To The Juridical Society, Edinburgh, In November, 1871
- Thomas Carlyle's Counsels To A Literary Aspirant: A Hitherto Unpublished Letter Of 1842 And What Came Of Them (1886)
- The Secret of Hegel: Being the Hegelian System in Origin, Principle, Form, and Matter
- Text-Book to Kant: The Critique of Pure Reason; Aesthetic, Categories, Schematism, Translation, Reproduction, Commentary, Index
- As Regards Protoplasm: In Relation to Professor Huxley's Essay On the Physical Basis of Life