Minute books, account books and annual reports; correspondence (mainly of Henry Tompkins and Donald Fincham as Secretary), with members, with other Positivists, Humanists and Historians, and concerning the August Comte Memorial Trust; notes and papers by Henry Tompkins, including a short autobiography, addresses on positivist subjects, and notes on books he had read; other positivist writings, including pamphlets, reports and the text of talks; and various ephemera and pictures, including photographs of members, broadsheets and programmes, typescripts of correspondence between August Comte and George Lewes, and notes on the history of the Society.