Letter from Alexander Fleck to David Christie Martin, Imperial Chemical Industries Limited, Imperial Chemical House, Millbank, London, SW1 'My dear Martin, Thanks very much for your letter of 9th inst with enclosures about Sir Thomas Merton's use of PFTE in creating a barrier against termites and other insects. I had already seen these letters which you were good enough to send me. I was certainly interested in the paper that Sir Thomas published in the Proceedings last year. Yours sincerely, Alexander Fleck'. 10 April 1956