Copy letter from Herbert Rix, to Professor Arthur Mason Worthington, Fellow of the Royal Society 'Dear Sir, With reference to the paper by yourself and Mr Cole which was voted for "Phil. Trans." ['Philosophical Transactions of the Royal Society'] on March 19, we have obtained from the Direct Photo Engraving Company a specimen print of one of your illustrations, made from their own negative. I inclose the specimen herewith and beg that you will let me know whether it is satisfactory and whether we may now put the whole of the photographs in hand. I am, yours truly, H Rix Asst. Sec. RS. [Assistant Secretary, Royal Society]'. 15 April 1896