Correspondence, notes and research, some dating from 1932 when Hodgkin (then Crowfoot) went to work in Bernal's laboratory in Cambridge, and some relating to other research projects. Hodgkin left Cambridge and returned to Oxford in 1934, and Bernal moved to Birkbeck College London in 1937. Their relations remained extemely close, on a personal and political level, as well as their mentor-pupil affinity which persisted. See Hodgkin and Ferry passim. See also MSS. Eng. c. 7945-7947, Hodgkin's publications about Bernal, which include some further orignal material assembled by her at the time of writing.