PALMER PHYSICAL LABORATORY PRINCETON UNIVERSITY PRINCETON, NEW JERSEY July 5, 1949 Professor Joshua Lederberg Genetics Department University of Wisconsin Madison 6, Wisconsin Dear Professor Lederberg: You may remember that about a year ago we went bof Sa together to an open-air theater in Wisconsin, Yie Veg atnep discussed at that occasion an article on ageing writ- ten by a colleague of yours in St. Louis. Perhaps ah gg | it may remind you of the article if I say that it contained the statement that ageing does not set in as long as the cells multiply vigorously and the organism growse As a result, the article said, fish do not age because they do not stop growinge I would very much appreciate if you could tell me who the writer of that article is and in which journal it may have appeared. I would like to read it again myself and I also have a friend who is greatly interested in the problem. Yours yy wr. Ee Pe EP legate epw semb