European Society for Neurochemistry meeting, Leipzig, East Germany, 23-28 July 1989 Katz delivered a plenary lecture. It was only Katz's second return to his home town (the first being the previous year). Earlier in 1989 (8-11 April) he also visited Halle for the Annual Meeting of the Deutsche Akademie der Naturforscher Leopoldina, and correspondence relating to this is also included. Correspondence re invitations, travel, applications for travel grants, arrangements and programmes. Some correspondence is in German, particularly re Leopoldina meeting. Also some correspondence re Elie de Cyon. Correspondents include Dietmar Biesold, Heinz Bethge. 1988-1989