The papers include a full range of notes on lectures attended by Hanson as an undergraduate, and of her own drafts for lectures, carefully revised each year, which provides a record of undergraduate teaching in zoology at Bedford College, 1938-1948. There is also the course of lectures in biophysics which she gave at King's College, 1960-1973. Hanson's research is represented by extensive laboratory notebooks and working papers, 1938-1973, which include ideas for research and comments on current and projected experiments as well as records and observations of works in progress. There are reports on the work of the Muscle Biophysics Unit, drafts for publications and unpublished invitation lectures and talks, and scientific correspondence. When Hanson or her principal colleagues were abroad on conferences, or visiting fellow-scientists and their laboratories, they exchanged frequent and extensive letters. A detailed picture can thus be formed of her own research and general progress in the field, and also of the scientists involved both in her laboratory and elsewhere.