March 26, 1992 Personal memo from JOSHUA LEDERBERG To: "46 years back: to 1946" Dear friend: I am circularizing this to a number of my colleagues who attended the 1946 Cold Spring Harbor Symposium. This is part of preparation of an autobiographical study:.in particular my first announcement of E. coli recombination in July at that meeting. (I don’t have the precise date of my presentation!) Unfortunately I have almost no documentation apart from the published symposium, and I am writing to you for any notes, program, agenda or recollections you may have -- particularly about my presentation. I do recall an extended debate with Delbruck, Lwoff, and perhaps others -- but few details. I would be most grateful to you for any detail you can furnish. Please forgive me if I have taxed you with this before. N.B. I am back in the lab now: see enclosure. Yours sincerely, Joshua Lederberg THE ROCKEFELLER UNIVERSITY -- New York 10021-6399 Enclosure: SEP page; (P4) Lederberg J., Tatum E.L. Novel genotypes in mixed cultures of biochemical mutants of bacteria Cold Spring Harbor Symp. Quant. Biol. 11: 113-114. (1946) Please use the attached note to let me know if you would like a copy of P268, P269: P268. Lederberg, J. Edward Lawrie Tatum. Biographical Memoirs, National Academy of Sciences. 59: 357-386 (1990). P269. Lederberg, J. Genetic Recombination in Bacteria: A Discovery Account. Ann. Rev. Genet. 21:23-46 (1987) card: (cross out what’s not applicable) Please send me: - #268 - #269 - I do (do not) have some material responding to your inquiry. Details to follow. fy