PuBLic HEALTH LABORATORY SERVICE (Directed by the Medical Research Council for the Ministry of Health) PUBLIC HEALTH LABORATORY OXFORD WALTON STREET 47884/5 OXFORD BRE /DCB elst June, 1954. Dear Dr, Lederberg, Thank you for your article. Please find enclosed a copy of Salm.seremban. I was extremely interested to see that you had transduced this organism from Salm.miami; does the XII of the latter completely correspond wi that of "seremban"? Yours sincerely, Dr. Joshua Lederberg, Department of Genetics, University of Wisconsin, Maddison, Wisconsin, U.S.&.