Copy letter from Robert William Frederick Harrison, to Professor [William Dobinson] Halliburton, Fellow of the Royal Society It has taken a while to trace the history of Dr Edridge-Green's 'Trichromic Case of Colour-blindness'. Green first sent a paper on 'The Evolution of the Colour Sense' to Professor Rucker's private address, and the professor communicated it to the Royal Society. It was treated as a physical matter and placed before the Physics Committee, where it was rejected. Professor Ramsay sent Rucker a note by Green on a 'Trichromic Case of Colour-blindness'. Rucker thought this was just a supplement to 'Colour Sense' and duly attached it to the ill-fated paper. Asks if Halliburton wishes to pursue the matter further, as any paper of physiological interest is ordinarily referred to his Committee. 27 March 1901