Copy letter from Robert William Frederick Harrison, to George Aitchison, 150 Harley Street, W. 'Dear Sir, With reference to your letter of yesterday's date, the library and meeting room, etc. (we have no laboratory) may be seen any time between 10.30 am and 6 pm. with the exception of Saturdays when we close at 1 pm. I am, Yours faithfully, Robt Harrison Asst. Sec. R. S. [Assistant Secretary, Royal Society]'. 1 October 1901