To promote the science of physiology and the exchange of ideas, the first congress of the International Union of Physiological Sciences (IUPS) was held in Basle, Switzerland, in 1889, and congresses have been held every three years since. The Union was incorporated at Washington, D.C., in 1953. The bulk of the Records of the IUPS relate to the International Congresses. Although representation is uneven, with a gap between 1907-1920, the records include programs, lists of members, abstracts of communications, and photographs, with more substantial documentation for meetings held in the United States. The collection also includes some general correspondence, minutes of meetings, reports of the Secretary, Executive Committee and Council correspondence, records relating to budgets, record books, and photographs.