UNIVERSITY OF ILLINOIS DEPARTMENT OF BACTERIOLOGY 362 NOYES LABORATORY OF CHEMISTRY URBANA October 23, 1950 Dr. J. Lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Joshua, Among the many casualties resulting from our moving there was the loss of the @61i mutabile Lwoff. Could you send me anothef transfer of it? We are just beginning to get séme work done but it will be quite a bit of time before things are Straightened out. I hope see you in Chicago pretty soon. Best regards/ to you and Esther. Yours, hee S. E. Luria SEL: mb