Copy letter from Herbert Rix, to Dr Klein, Fellow of the Royal Society 'Dear Sir, Herewith enclosed I send a letter from Mr C.S. [Charles Sissmore] Tomes which explains the slides belonging to Mr Mumnery's[?] paper. The slides themselves were sent to you at the end of last week. Yours truly Herbert Rix Asst. Sec. RS [Assistant Secretary, Royal Society]'. 23 March 1891