Report to the Trustees on attendance at 'IV International Congress of Ecology' together with the '71st Annual General Meeting of the Ecological Society of America' and the '5th Meeting of the International Society for Ecological Modelling' held at the State University of New York at Syracuse and Syracuse University, August 10-16, 1986. and 'X International Congress of Arachnology' held at Jaca, Spain, September 2-7, 1986.