Having accepted the task to organize, in Amsterdam, an international Congress in behalf of the International Sodety for Neurovegetati'V'e Research such as is held every second year, it occurred to me that it might be worth- while to change its usual pattern somewhat. Instead of giving merely the opportunity for l'eading a nurnber of rather short free papers, more or less grouped in many categories, we decided to start with a symposium on a special topic 'to be dealt with from several aspects by a numbe*r of invited speakers, the last day of the congress being only available for short free...