London School of Hygiene and Tropical Medicine Vy VE & Dr, ~ * & 1980 i Keppel Street (Gower Street) London WC1E 7HT Telephone 01-636 8636 Telegrams Hygower London WCi From the Dean C E Gordon Smith CB MD FRCP FRCPath 10th July, 1980. Dear Dr. Lederberg, Thank you for your telegram and your memo. I am very sorry that you cannot accept the Heath Clark Lectureship but quite understand the pressures which prevent you. It would indeed be a great pleasure to have you here for a week or so and if you are to be in London for any reason please let me know so that we can take advantage. We could certainly contribute to your expenses to lengthen your stay. The longer warning you can give me of any such visit, the better use we could plan to make of it. I shall look forward to seeing you then. Kind regards. Yours sincerely, Dr. Joshua Lederberg, President, The Rockefeller University, New York, N.Y. 10021, U.S.A.