COMMITTEE FOR RESEARCH ON PROBLEMS OF SEX , MEDICAL DIVISION , NATIONAL RESEARCH COUNCIL

GEORGE W. CORNER , M.D., Chairman. Director, Department of Embryology, Carnegie Institution of Washington, Baltimore, Md.

WILLARD M. ALLEN , M.D., Professor of Obstetrics and Gynecology, Washington University, St. Louis, Missouri

CLYDE L. KLUCKHOHN , PH .D., Professor of Anthropology, Harvard University, Cambridge, Mass.

KARL S. LASHLEY , PH .D., Professor of Psychology, Harvard University; Director, Yerkes Laboratories for Primate Biology, Orange Park, Florida

C. N. H. LONG , D.SC. , M.D., Professor of Physiological Chemistry, Yale University, New Haven, Conn.

CARL R. MOORE , PH .D., Professor of Zoology, The University of Chicago, Chicago, Illinois

JAMES V. NEEL , PH .D., M.D., Geneticist, Laboratory of Vertebrate Zoology, University of Michigan, Ann Arbor, Michigan

MILTON C. WINTERNITZ , M.D., ex officio . Director, Division of Medical Sciences, National Research Council, Washington, D. C.