Preliminary Announcement XXth International Conference of the History of Science University of Liege, Belgium 25-30 July 1997 This quadrennial meeting is held under the auspices of the International Union of the History and Philosophy of Science, Division of History of Science. The meeting theme is *Science, Technology, and Industry.* Key dates: Second Circular and Registration Form (September 1996) Third Circular (February 1997); Deadline for Abstracts (April 1997). Those wishing to receive information about the conference please contact the Congress office: Centre d'Historie des Sciences et des Techniques Unitersite de Liege Avenue des Tilleuls 15 B-4000 Liege Phone: 32 41 669 479 Fax: 32 41 669 547