Copy letter from Herbert Rix, to Professor Karl Pearson, University College, Gower Street, W.C. 'Dear Sir, Your paper and Prof. [Professor] Weldon's will almost certainly be read on November 16th, but we will send notice when date is finally settled. It would certainly be an advantage if you would bring some of your slides with you; our lantern is always ready for use. Yours truly, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 25 October 1893