XVIIIth Leeds-Lyon Symposium The XVIIIth Leeds-Lyon Symposium on Tribology will be held at the National Institute of Applied Sciences (INSA) of Lyon, September 3-6, 1991. The topic this year is “Wear particles: from the cradle to the grave”. For further information write to: Professor M. Godet, Laboratoire de MCcanique des Contacts, INSA, B&timent 113, 69621 Villeurbanne Cedex, France (Tel. (33) 72 43 82 24, Fax. (33) 78 89 09 80).