UNIVERSITY OF ILLINOIS DEPARTMENT OF BACTERIOLOGY 362 CHEMISTRY BUILDING URBANA October 17, 1952 Dr. J. lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Joshua: Lardy wrote me about a lecture in December or January. I suggested December 3 since our vacation ends December l, If you are not there at that time or if you want to hold us to our promise to visit you earlier, we shall try to do so, Best regards, Sincerely yours, Ho S. E. luria SELsoz