Hamilton, Sir W. Discussions on Philosophy. Second ed. London, 1853.

Comte, Auguste. Cours de Philosophie Positive. Five vols. Paris, 1830-42.—Politique Positive. Four vols. Paris, 1851-54.

Caird, Edward. The Social Philosophy of Auguste Comte. Glasgow, 1885.

Levy-Bruhl. The Philosophy of Auguste Comte. English trans. London, 1903.

Whewell, Wm. Philosophy of the Inductive Sciences. London, 1840.

Mill, J. S. A System of Logic. Two vols. London, 1843.—On Liberty. London, 1859.—Utilitarianism. London, 1863.—Examination of Sir William Hamilton's Philosophy. London, 1865.

Whittaker, T. "Comte and Mill," in Philosophies Ancient and Modern. London, 1908.

Spencer, Herbert. First Principles. London, 1862.—Essays. Three vols. London, 1891.—Autobiography. London, 1904.

Macpherson, Hector. Herbert Spencer. London, 1900.