ABNEY, SIR WILLIAM DE WIVELESLIE 1920), English chemist, was born at Derby July 24 1843 and died at Folkestone on Dec. 3 1920. Abney held high appointments at the board of education and was president at different times of the Royal Astronomical Society and the Physical Society. His con tribution to science was mainly in the furtherance of photographic chemistry and especially of colour photography and colour print ing. His publications on these subjects include Instruction in Photography (1870) ; Colour Vision, Colour Measurement and Mixture (1893); and Tric/iromatic Theory of Colour (1914). He also wrote Thebes and its Five Great Temples (1876), and, with C. D. Cunningham, The Pioneers of the Alps (1888).