The Conference was supported by a grant to the Smithsonian Institution from the Center for the Studies of Narcotic and Drug Abuse, National Institute of Mental Health. We wish to acknowledge the knowledgeable guidance of Miss Eleanor Carroll of the Center in developing the Conference program, and the able assistance of Mrs. Valerie Ashenfelter and Mr. William Douglass of the Center for the Study of Man (Smithsonian) in orgahizing the conference and travel arrangements. We also wish to express our appreciation to Mr. James Helsing, Office of Communications, National Institute of Mental Health, for his professional services and to Mrs. June Anderson and the Research Institute for the Study of Man staff for their invaluable support in the preparation of the manuscript for this volume. We are especially thankful to the participants, who made the Conference a pleasant as well as productive experience.

VERA RUBIN