Copy letter from Robert William Frederick Harrison, to Messrs Horace Lamb & Company, 20 Tudor Street, E.C. 'Gentkemen, With reference to the two accounts for paper enclosed [not enclosed], will you please verify whether the quantity supplied is 24 reams or 12 reams. Only one account is marked "To Harrisons". I am, Yours faithfully, Robt Harrison Assistant Secretary, R.S. [Royal Society]'. 20 October 1905