Copy letter from an unknown correspondent, to Messrs Waterlow & Sons, Finsbury Works, E.C. 'Kindly let me have estimate for a half-tone block of the spectra inclosed herewith, illustrating a paper by Mr Norman Lockyer on "8 Cephai". Mr Lockyer hopes that you will take special care over this block. If it is necessary for you to have the negative you had better apply direct to him at Royal College of Science, South Kensington. But do not put it in hand until your estimate is accepted'. 29 November 1895