The University of Chicago CHICAGO 37, ILLINOIS Institute of Radiobiology and Biopbysics 6200 Drexel Avenue November 29, 1949 Dr. Joshua Lederberg Department of Genetics University of Wisconsin Madison 6, Wisconsin Dear Dr. Lederberg: Thanks very much for your letter of November 25, On looking over my calendar, I find that it will be a little difficult for me to get away before the time that you will be in Chicago. If it should be pos- sible, I can give you a ring, but I shall probably have to plan to see you December 19 or 20. If you have any sug- gestions as to the time we could get together, I should be glad to have them. With best regards, Yours very sincerely, T. R. Goeness Director