Book entitled 'Researches on Light: An Examination of all the Phenomena connected with the Chemical and Molecular changes Produced by the Influence of Solar Rays Embracing all the Known Photographic Processes and New Discoveries in the Art' by Robert Hunt, 1844. Published by Longman, Brown, Green and Longmans, Bound by A Spottiswoode, New Street Square, London and Kennant & Edmonds, London.