As a former president of the International Society for Neuro- vegetative Research and as a co-editor it is a pleasure to write a short introduction to the present volume which contains the proceedings of an international symposium, held at Tihany, Hungary, June 19-24, 1972, under the auspices of the Society mentioned above. The meeting, which was organized by Professor B. Csillik, Szeged, Hungary, who also acted as president, took place at the Tihany Biological Institute, most beautifully situated at lake Balaton. Such international symposia of the International Society for Neurovegetative...