This site documents the initial period of the discovery and development of insulin, 1920-1925, here at the University of Toronto. It presents over seven thousand page images reproducing original documents ranging from laboratory notebooks and charts, correspondence, writings, and published papers to photographs, awards, clippings, scrapbooks, printed ephemera and artifacts. Drawing mainly on the Banting, Best and related collections housed at the Thomas Fisher Rare Book Library and the Archives and Records Management Services at the University of Toronto, it also includes significant holdings from the Aventis Pasteur (formerly Connaught) Archives, and the personal collection of Dr. Henry Best.