These are all autograph manuscript, rarely fully dated. They are presented in approximately chronological order, with dates assigned on the basis of content or reference. All aspects of Hodgkin's life and contact with Bernal are dealt with, beginning with her first visit to his laboratory (Aug. 1932) and the Ravenna conference (Sept. 1932). After her return to Oxford there are many references to her visit to consult him in Cambridge or arrangements for left-wing political meetings, juxtaposed, sometimes incongruously, with research information and ideas which occupied part of her mind in whatever emotional circumstances. G. Ferry draws on these letters extensively in her biography of Hodgkin, particularly chapters 3-5. Several of Hodgkin's letters to Thomas include references to Bernal's visits to Oxford on scientific or political matters. Files comprise: