>The author wishes to express his thanks to Dr. A. Hoffer, Director of Psychi- atric Research for the Province of Saskatchewan, for encouragement and advice received during the preparation of this review and to Dr. R. Abramovitch and Dr. V. Woodford of the University of Saskatchewan for critical reading of the manuscript, Financial support from the Rockefeller Foundation, the Federal Department of Health and Welfare (Ottawa), and the Saskatchewan Committee on Schizo- phrenia Research is also gratefully acknowledged.
>Dr. R. Abramovitch
>Rockefeller Foundation