His
magnum opus is his
Life of Milton in Connexion with the History of His Own Time in six volumes, the first of which appeared in 1858 and the last in 1880. He also edited the library edition of
Milton's Poetical Works (3 vols., 1874), and
De Quincey's Collected Works (14 vols., 1889-1890). Among his other publications are
- Essays, Biographical and Critical (1856, reprinted with additions, 3 vols., 1874)
- British Novelists and their Styles (1859)
- Drummond of Hawthornden (1873)
- Chatterton (1873)
- Edinburgh Sketches (1892)