Copy letter from an unknown correspondent, to Mr Collings, 172 Strand 'Mr Emery's paper Herewith seven dias [diagrams] to be done for Proceedings ['Proceedings of the Royal Society']: b. on w. [black on white] Fig. 2 I imagine will have to be full page, but I leave to your judgement the amount of reduction advisable in each case'. 9 February 1894