Principles of ion and water transport across epithelia, Martin C.Steward and R.Maynard Case; macromolecular synthesis, storage and secretion, Michele Mantle; stimulus - secretion coupling, O.H.Petersen and D.V.Gallacher; control of gastric secretion, J.S.Davison; control of the exocrine pancreas, J.S.Davison; hepatobiliary secretion, Eldon A.Shaffer; small intestinal absorption and secretion of fluid and electrolytes, E.V.O'Loughlin and D.Grant Gall; overview of small intestinal diarrhoea due to defects in active transport, E.V.O'Loughlin and D.Grant Gall; control of intestinal secretion, Kenneth A.Hubel; gastrointestinal mucus, Michele Mantle and Adrian Allen; relationship between gastrointestinal motor activity and secretion, Beverley Greenwood.