Copy letter from Herbert Rix, to Mr Collings, Surrey Chambers, 172 Strand, W.C. 'We have thirty diagrams and tracings to illustrate a paper by Dr Spencer for which we require an estimate immediately. As we are shorthanded I will trouble you to send for them. They are to be done as blocks to go into the text of "Phil. Trans" ['Philosophical Transactions of the Royal Society']. HR'. 7 March 1894