This fonds contains correspondence, notes, reports, teaching and research materials, and manuscripts and drafts documenting the professional and academic activities of Dr. Mills over the course of his career. Files pertaining to research and writing focus on the areas of psycholinguistics and the history of psychology, including material on eighteenth and early nineteenth century Scottish philosophy and the history of behaviourism. The material on teaching covers topics such as social psychology, experimental design, perception, learning, psycholinguistics, comparative psychology, and history and systems