Volume 1 (c 400pp): Introduction by Thomas Duddy; "Sight and Touch", Thomas Kingsmill Abbott, (1864), 178 pp; "Space and Vision", W.H.S. Monck, (1872), 87 pp; "The Objectivity of Truth", George Joseph Stokes, (1884), 118 pp. Volume 2 (564pp): "The Philosophy of Human Nature", Henry MacCormac, (1837). Volume 3 (355pp): "Essay on the Platonic Idea", Thomas Maguire, (1866), 187 pp; "Introduction to the Critical Philosophy", W.H.S. Monck, (1874), 168 pp. Volume 4 (403pp): "The Creed of Science", William Graham, (1881). Volume 5 (272pp): "The Gifford Lectures, Part 1", George Gabriel Stokes, Natural Theology (1891). Volume 6 (272pp): "The Gifford Lectures, Part 2", George Gabriel Stokes, Natural Theology (1893).