THE CHESTER BEATTY RESEARCH INSTITUTE TELEGRAMS: CANCER, SQUTH KENS, LONDON. THE ROYAL CANCER HOSPITAL, TELEPHONE: FLAXMAN 1484-5 geeesee {148° FULHAM ROAD, LONDON, S.W. 3. FROM: PROFESSOR ALEX.HADDOW, M.D.,D.Sc., Ph.D. (e1rectoR) 23rd February 1954. Dear Dr. Lederberg, This is simply to thank you for so very kindly sending me copies of your recent papers. I have found them, as always, of the greatest interest, and hope you will favour me with others as they appear in future. With kind regards, ours sincerely, COWbwe a? a Dr. Joshua Lederberg, Department of Genetics, Univers ty of Wisconsin, Madison, Wis., U.S.A.