Livingstone, David, 1813-1873. Letter to Joseph D. Hooker, 19 October 1864. Images copyright Royal Botanic Gardens, Kew. Images reproduced with the kind permission of the Board of Trustees of the Royal Botanic Gardens, Kew (http://www.kew.org/). As relevant, copyright Dr. Neil Imray Livingstone Wilson. Creative Commons Attribution-NonCommercial 3.0 Unported (https://creativecommons.org/licenses/by-nc/3.0/). 