Copy letter from Herbert Rix, to Mr Collings 'Herewith 5 dias. [diagrams] for a "Phil. Trans." ['Philosophical Transactions of the Royal Society'] paper by Prof. [Professor Charles Vernon] Boys. Please let me have estimate at once. Also, 23 figures on 3 sheets, which he intends for lithography; but I should like to know first whether they cannot be reproduced by zinco, and if so, what the cost would be. I send photos. of the same to show how they would reduce. Return the originals with your answer. HR'. 25 July 1894