COLORADO GENERAL HOSPITAL UNIVERSITY OF COLORADO MEDICAL CENTER 4200 EAST NINTH AVENUE DENVER 20, COLORADO June 7, 1960 COLORADO PSYCHOPATHIC HOSPITAL SCHOOL OF MEDICINE Dr. Joshua Lederberg Department of Genetics Stanford University Palo Alto, California Dear Joshua: Thank you for your letter in regard to Gus Nossal's Ph.D. I interpreted Dean Rogers! letter to mean that we would need to consult with each other only if we had some question about endorsing the thesis. I assume from your letter that you and Burnet have both approved it. I thought it was an excellent piece of work and have written Dean Rogers indicating my endorsement, Has Sir MacFarlane already departed for London? If not, tell him that he ‘vould be most welcome here in Denver at any time. With best wishes, Sincerely yours, David W. Talmage, M.D. DWT: hh