THE JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE DEPARTMENT OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS 725 NORTH WOLFE STREET BALTIMORE, MARYLAND 21205 January 7, 1980 Dr. Joshua Lederberg President Rockefeller University New York, New York 10021 Dear Dr. Lederberg, I would like to thank you for the hospitality that you showed me on my recent visit to the Rockefeller. I particularly enjoyed the opportunity of hearing the Guaneri String Quartet. Our discussions were helpful; and I anticipate that Sol will be in touch with you. Sincerely, Assoctate Professor of Pharmacology and Psychiatry JTC/ck