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Edgar Yoxall Jones, Father of art photography: O. G. Rejlander, 1813-1875 (Newton Abbot, 1973)

Darwin met the Swedish photographer Oscar Rejlander, famous for his character studies, in 1871. Rejlander, who was based in London, went on to provide twenty of the images published in Expression, more than half the photographs in the book.

Charles Darwin to James Crichton-Browne (April, 1871)

'I am, however, now rich in photographs, for I have found a photographer in London. Rejlander, who for years has had a passion for photographing all sorts of chance expressions exhibited on various occasions, especially by children, and taken instantaneously.'