Correspondence and papers, c1870-1959, of and relating to Frank Lenwood, including papers and correspondence, c1870-1920, concerning his parents Walter and Charlotte Lenwood; his early essays and press cuttings about him, c1881-1910; letters to his parents and correspondence about his schooling, 1882-1895; letters received from various correspondents, 1893-1933; printed circulars and personal letters from Lenwood and his wife Gertrude from trips to London Missionary Society (LMS) missions in China, India, Benares, the South Seas and Papua, 1906-1916, 1922; letters to various correspondents on religious and personal matters, 1916-1934, including his connection with Greengate Congregational Church; notebooks relating to preaching, 1926-1934 and undated; working papers on the `Oxford Group' movement, c1931-1933; copies of his articles and pamphlets, 1900-1933; copy of An order for the Solemnization of Matrimony ... with an order for the Burial of the Dead, undated, with annotations by Lenwood, 1900-1934 where dated; extracts from his diaries and letters, 1893-1935, for the use of his biographer, and reviews of the biography, 1936-1937; correspondence about the disposal of his books and papers, 1959.

Papers of Colin William Fraser McClare, c1957-1981, comprising biographical and autobiographical material; laboratory notebooks c1964-1976; 'ideas' diaries; drafts for lectures and papers (not all published) c1959-c1976; teaching material, in particular for a course on the 'Social Impact of the Biosciences' which started in 1973, with which McClare had been closely involved; a set of McClare's publications including his major papers on bioenergetics and the correspondence arising; correspondence, 1964-1976 (mainly early 1970s), includes letters exchanged with the philosopher Sir Karl Raimund Popper, who offered considerable encouragement to McClare's early attempts to formulate and publish his scientific ideas, and whose philosophy McClare acknowledged as a profound influence.