Letter from R.E.S Cooper, District Engineer, London Brighton and South Coast Railway, District Engineers Office, East Croydon, to The Secretary, The Royal Society, Burlington House Requests information on the price of the Report of the Committee of the Royal Society on Colour Vision, as well as the prices of later papers on the subject. Seeks references to recent literature on colour vision, especially methods for testing colour appreciation. Expresses the intention to report on the periodic examination of railway employees for colour vision. 24 March 1909