October 12, 1949. Dr. Ralph Emerson, Dept. of Botany, University of California, Berkeley 4, Calif. Dear Emerson! Thank you for your complimentary remarks, I think that you have most everything published on FE. coli genetics and methods. You may not yet have heard that I will have an appointment at Berkeley in the Department of Bacterlology, for the Summer Seasion IT. I expect to give a course in microbial genetiss. I hope that you will not, by chance or design, pick this particular time to be away from the campus, as I am looking forward, very earnestly, to meeting with you ani seeing some of your extraoctdinary work on Allomyces and Blastocladiella. Sincerely, Joshua Lederberg Assistant Professor of Genetécs