Papers of the Wellcome Bureau of Scientific Research (WBSR), 1913-1939, comprising reports, administrative records, correspondence and publications. Including papers relating to the Wellcome Chemical Research Laboratories (WCRL), Wellcome Physiological Research Laboratories (WPRL), Wellcome Museum of Tropical Medicine and Hygiene, Wellcome Entomological Field Laboratories (WEFL), and Burrough's Wellcome and Co. Also containing papers of Andrew Balfour and papers of Charles Morley Wenyon.