The author and publishers wish to express their thanks to the following sources of illustrative material and/or permission to reproduce it.
photo: Donald Cooper / Rex Features: p. 164; © DACS p. 93; photo Ian Dryden/Rex Features: p. 24; Gemäldegalerie Dresden: p. 170; from an issue of L’Illustration from 1895: p. 46; photos Marilyn Kingwill / ArenaPAL: pp. 10, 141, 158; photo Andy Lopez / Library of Congress, Washington, DC: p. 21; photos courtesy the National Library of Ireland, Dublin: pp. 27, 34; reproduced courtesy of the Headmaster, Portora Royal School, Enniskillen: p. 28; photo Rex Features: p. 137; Staatliche Kunstsammlungen, Dresden: p. 89; photos © Studio Lipnitzki / Roger-Viollet, courtesy Rex Features: pp. 129, 130, 132, 134; Tate Modern, London (photo © Tate, London 2008): p. 93.