Copy letter from Herbert Rix, to Professor Joseph John Thomson, Fellow of the Royal Society 'Dear Sir, Could you let me know at once whether you will undertake the correction of Messrs Threlfall & Adair's [Richard Threlfall and John Frederick Adair] proof (you being communicator of their paper) or whether I must send the proof to Sydney? Two tracings (curves) were in the leaves of MS [manuscript], to which we can find no reference in the text. May I send them to you to ask whether they are to be reproduced? Yours truly H Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 21 September 1889