Our aim in this volume, as in Volume I, HormonaI Correlates of Behavior: A Life Span View, has been to provide a critical assess ment of the state of behavioral endocrinology as weIl as the more usual summary of extant data. Each contributor was asked to probe the strengths and weaknesses of his area as candidly as possible. As aresult, we hope the reader will find this Volume useful as a reference source and as an honest evaluation of our present know ledge of the interaction between hormones and behavior. R. L. Sprott Bar Harbor, 1975 B. E. Eleftheriou v CONTRIBUTORS Robert Ader, Ph.D., Department of Psychiatry, University of Rochester Schoo1 of Medicine and Dentistry, Rochester, New York 14642. F. R. Brush, Ph.D., Experimental Psychology Laboratory, Syracuse University, Syracuse, New York 13210. Robert M. Benson, M.D., Pediatric Endocrine Clinic, Children's Medical and Surgical Center, The Johns Hopkins Hospital and University, Baltimore, Maryland 21205. John J. Christian, Sc.D., Department of Biological Sciences, Univer sity of New York at Binghamton, Binghamton, New York 13901. David A. Edwards, Ph.D., Department of Psychology, Emory University, Atlanta, Georgia 30304. Carl Eisdorfer, Ph.D., M.D., Department of Psychiatry and Behaviora1 Sciences, School of Medicine, University of Washington, Seattle, Washington 98101. Basil E. Eleftheriou, Ph.D., The Jackson Laboratory, Bar Harbor, Maine 04609. Merri11 F. Elias, Ph.D., Department of Psychology and All-University Gerontology Center, Syracuse University, Syracuse, New York 13210.