Copy letter from Herbert Rix, to J R Shannon, 51 Torrington Square, W.C. The memoir of [Franz Cornelius] Donders can only be obtained in number 300 of 'Proceedings [of the Royal Society]' priced at four shillings. The Report of the Colour Vision Committee will ultimately be published as a Parliamentary Report, meanwhile it will be published shortly in number 311 of the 'Proceedings' at present it cannot be obtained at all, having been only privately printed. 28 June 1892