Copy letter from Robert William Frederick Harrison to Dr Richard Tetley Glazebrook FRS 'Your letter of the 5th arrived after Mr Watson's paper on "The sensibility of the eye to variations of wave-length" had gone into pages, so that it is difficult to send you the separate copies you asked for in proof form. I think the best plan now would be for you to apply to the author for copies of his off-prints, which will be struck off as soon as the paper is published.' 10 July 1911