Copy letter from Herbert Rix, to Mr Collings, Surrey Chambers, 172 Strand, W.C. 'Please put in hand at once for our next meeting the two inclosed dias. [diagrams]. They may be done by zinco; for our "Proceedings" ['Proceedings of the Royal Society']. Also, call here at your earliest convenience to take instructions about a number of illustrations for the Bakerian Lecture. HR' 6 April 1894