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.