Copy letter from Herbert Rix, to Messrs Trübner & Company 'Dear Sir, We close our a/cs [accounts] for audit at the end of this month. Kindly let me have your a/c sales by the 26th inst. [instant] if possible, including the Lendenfeld "Krakatoa" a/c up to date. Yours faithfully Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 17 October 1889