James Martineau to Hallam Tennyson (1893), recalling meetings of the Metaphysical Society: 'I remember a special interest shown by your father in a paper contributed by the Rev. F. D. Maurice on the meaning of the words "Nature," "Natural," "Supernatural," November 21st, 1871 [...] 'The other subjects on which papers were read in your father's presence were the following: 'July 14, 1869. The commonsense philosophy of causation: Dr W. B. Carpenter. 'June 15, 1870. Is there any Axiom of Causation? Myself. (Mr Tennyson in the chair.) 'July 13. The relativity of Knowledge: Mr Fred. Harrison. 'Dec. 13. The emotion of Conviction: Mr Walter Bagehot. 'July 11, 1871. What is Death? Bishop of Gloucester and Bristol. 'July 9, 1872. The supposed necessity for seeking a solution of ultimate Metaphysical Problems: Mr F. Harrison. Nov. 12. The five idols of the Theatre: Mr Shadworth H. Hodgson. Dec. 16, 1873. Utilitarianism: Professor Henry Sidgwick. Feb. 12, 1878. Double truth: Rev. M. Pattison, Rector of Lincoln College, Oxford.'