The Australian National Hoinersity CANBERRA e THE JOHN CURTIN SCHOOL OF MEDICAL RESEARCH DEPARTMENT OF MICROBIOLOGY TELEPHONE: : . xBeagjexorsctuieicoracx SK Box 4, G.P.0., CANBERRA, A.C. T. 2ist April, 1953. Dr, J. Lederberg, Department of Genetics, University of Wisconsin, Madison, Wisconsin, U.S. A. Dear Dr. Lederberg, Thankyou for your letter of April 12th. I think that I will be able to make Madison on June 1st. I expect. to spend the weekend at Denver,. and my time of arrival on Monday will depend upon plane connections from Chicago to Madison, From May 24th <= May 27th I can be contacted in San Francisco c/~ Dr. W. C. Reeves, William Hooper Foundation, University of California, Berkeley, San Francisco, CALIFORNIA, U.S.A. I look forward greatly to a discussion with you of your very exciting work. Yours sincerely, Tha then. (Frank Fenner), Professor of Microbiology.