Letter from the Managing Director of The International Aspirator Company, 353 Oxford Street, London, to the Assistant Secretary of the Royal Society, Burlington House, Piccadilly 'Dear Sir, We are in receipt of your favour of the 29th inst., and have pleasure in enclosing you herewith copy of Invoice amounting to £26:6:0 as requested. We are, dear Sir, Yours faithfully [?]. Managin Director'. 30 October 1907