Livingstone, David, 1813-1873. Letter to William J. Hooker, 5 February 1857. 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/). 