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• Letter to Charles Lyell, 1 October 1861
• Letter to W. D. Fox, 7 May 1855
• Letter to J. D. Hooker, 17 June 1868
• Letter to T. H. Huxley, 10 September 1860
• Letter to John Lubbock, 3 September 1862
• Letter to W. D. Fox, 24 October 1852
• Letter to W. E. Darwin, 30 November 1861