STANFORD UNIVERSITY STANFORD, CALIFORNIA DEPARTMENT OF BIOLOGICAL SCIENCES July 6, 1955 Dr. Joshua Lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Dr. Lederberg: Just a line to thank you on behalf of the Society for the excellent paper you gave at the Amherst Symposium. Every one was most enthusiastic about it, and I hope also that you enjoyed and profited from the meetings yourself. I am glad I had the opportunity of meeting you, and also of seeing your wife Esther again. Thank you also for the reprint describing the pro- cedure for isolating single cells in culture. I plan to try it, and feel it should lend itself to work with tissue cells. a Very best regards. Sincerely, | ct Ln a Victor Twitty VCT: gz