ARMY MEDICAL SERVICE GRADUATE SCHOOL WALTER REED ARMY MEDICAL CENTER WASHINGTON 12, D.c. 3/ IN REPLY REFER TO May 15, 1953 Dr. J. Lederberg Department of Genetics: University of Wisconsin College of Agriculture Madison, Wisconsin Dear Dr. Lederberg, I am planning to arrive in Madison some time during the week of May 18 for a few days at your laboratory. Iwill be at the University of Illinois during the early part of the week, but will attempt to get to Madison by late Wednesday or Thursday. Thank you for your kind hospitality. Sincerely yours, L. 5. Baron Dept Bacterial Physiolocy Immunology Division