On April 8-9, 1994, a symposium entitled Control of the Cardiovascular and Respiratory Systems in Health and Disease was held at the University of California Davis Medical Center in Sacramento. The purpose of this symposium was to honor the careers of Professors Hazel M. and John C. G. Coleridge. Participants in this symposium came from throughout the world. Their attendance at the symposium was a symbol of great respect and affection for the honorees. The Professors Coleridge have made many important contribu­ tions to the scientific literature concerning neural control of the cardiovascular and respira­ tory systems. In addition, they have made remarkable contributions to the lives of other scientists working in this field of investigation. Some of us have known them as mentors, counselors, friends, and supervisors; others have known them as co-investigators. Most importantly, all of us have known them as friends. This book, which contains the proceedings of the symposium, is dedicated to Hazel and John Coleridge. C. T. Kappagoda M. P. Kaufman v ACKNOWLEDGMENTS We wish to acknowledge the financial support of the following agencies for making this symposium a reality: . Astra Merck Group (Tarek Ackad, M. D. , Ph. D. ) . Boehringer Ingelheim Pharmaceuticals, Inc. (Ms. Kathryn B. Lucas and Mr. Allan Holloway) . Bristol-Myers Squibb (David L. Cram, Jr. , Pharm. D. ) . Marion/Merrrell Dow, Inc. (Mr. Brian Scheffield) . Merck and Company (Mr. Johnathan Sakakibara) . Pfizer Laboratories (Mr.