Letter from the Director of The International Aspirator Company, 353 Oxford Street, London, to The Royal Society, Burlington House, Piccadilly 'Gentlemen, We thank you for your cheque for £26:6:0 received this morning in payment of account, for which we return you receipted invoice herewith. We trust the mahcine is giving every satisfaction, And remain, Gentlemen, Yours faithfully, [?] Director'. 1 November 1907