1. Secord, J.A. (2000) Victorian Sensation: The Extraordinary Publication, Reception, and Secret Authorship of Vestiges of the Natural History of Creation, Chicago and London: University of Chicago Press, quotation p. 9.
2. Browne, J. (2002) Charles Darwin: The Power of Place, London: Jonathan Cape, p. 152. This splendid biography, the second volume of two, is the major source of my information on Darwin in this essay.
3. Ford, C. (2003) Julia Margaret Cameron: 19th Century Photographer of Genius. London: National Portrait Gallery, quotation p. 45.
4. Browne, Darwin, p. 382.
5. Ford, Cameron, pp. 47–50.