Letter, 12 September 1870
Letter, 15 February 1872
Letter, 24 February 1872
Letter, 19 November 1874
Letter, 22 March 1875
Letter, 8 August 1876
Letter, 2 August 1877
Letter, 28 July 1882
Letter, 11 February 1885
Letter, 11 February 1885
Letter, 17 March 1887