Papers of Reginald Stephen Stacey, 1931-1972, mainly relating to his pharmacology work at St Thomas's Hospital, London, comprising laboratory notebooks, 1931 and 1956-1967, containing pharmacological testing methods, experiments, observations and research; working papers, 1952-1972, notably comprising notes, correspondence, drafts and offprints relating to Stacey's work on 5-Hydroxy-tryptamine (5-HT), platelets, brain amines, and the effects of various drugs; publications, 1949-1970, including works on platelets, the relation of brain amines to depression, and other pharmacological issues; lectures by Stacey, 1955-1971, on platelets, 5-HT, iatrogenic diseases, therapeutics, and types of drugs; conference papers, 1967-1968; material relating to committees and societies, 1963-1972, including the British Journal of Pharmacology, the British National Committee for Physiological Sciences, the British Pharmacological Society, the British Pharacopeia Commission, the Research Defence Society, and the Society for Drug Research; correspondence, 1959-1972, with academics and scientists; teaching material, 1949-1970, for courses in pharamacology, therapeutics and anaesthetics; papers relating to the University of London and other examining bodies, 1964-1970; and biographical material relating to Stacey, including photographs, 1932-1938 and 1968, and obituary notices.