Supported by grants from the National Institute of Neurological Diseases and Blindness (B-732) and from the Research Committee of the University of Wisconsin out of funds provided by the Wisconsin Alumni Research Foundation.
Kenny Foundation Scholar since 1957. The authors would like to express their warmest appreciation to Dr. Clinton N. Woolsey for his generous support and counsel throughout the course of this study and for his valuable suggestions during the preparation of the manuscript. We would also like to express our gratitude to Mr. J. R. Smith, Superintendent, Game Management Division of the Wisconsin Department of Conservation, and to Mr. W. A. Ozburn, Manager of the State Game Farm, for providing us with the animals used in this study.
Laboratory of Neurophysiology, Department of Physiology, Medical School, University of Wisconsin, Madison, Wisconsin