Livingstone, David, 1813-1873. Letter to Horace Waller, 21 April 1863. Images copyright The Bodleian Library, University of Oxford. Used by permission. As relevant, copyright Dr. Neil Imray Livingstone Wilson. Creative Commons Attribution-NonCommercial 3.0 Unported (https://creativecommons.org/licenses/by-nc/3.0/). 