The Jane Coffin Childs Memorial Fund for Medical Research Board of Scientific Advisers Office of Director S. BAYNE-JONES, Director Yale University School of Medicine RALPH G. MEADER, Assistant Director 7 ‘ 333 Cedar Street UDOLPH J. ANDERSON New Haven 11, Connecticut Ross G. HARRISON JOHN J. MORTON PEYTON Rous GEORGE M. SMITH M. C. WINTERNITZ November 26, 1946 Mr. Joshua Lederberg Csborn Botanical Laboratory Yale University School of Medicine Dear Mr. Lederberg: Thank you for furnishing to the Fund twenty-five reprint cories of the following article, which acknowledges aid from the Fund: Lederberg, Joshua, Tatum, E. L. Detection of biochemical mutants of microorganisms J. Biol. Chem., 165, No. 1, September, 1946, 381-382. Sincerely yours, LRG Meader R. G. Meader rgm:em