This file contains material relating to the First International Congress of Neurological Sciences, Brussels, which was held 21 July 1957-28 July 1957. The material consists of a programme of the congress; a duplicated draft, with manuscript additions and revisions by Dott, of 'Constitution of the International Federation of Neurosurgical Societies' to be considered at meeting of Society of British Neurological Surgeons (The Brussels Conference was the first International Congress held by the Federation.); and correspondence with Sir Geoffrey Jefferson, 1956. The correspondence relates to personal and professional matters, and the Brussels Conference.