Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society 'Dear Sir, Can you bring diagrams next Thursday for your paper? I fear we cannot get all the blocks done in that time; besides which it would be somewhat informal to put so many in hand before the paper is voted. Yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 17 November 1893