The material relates to the 150th Anniversary Congress, Imperial College London, 8-11 Apr. 1991, and the Dorothy Hodgkin Symposium on 'Crystallography' which was held as part of the Congress on 9 Apr. See also MS. Eng. c. 5662/5 in the main Hodgkin papers. The symposium was organised by the Women Chemists' Committee of the Royal Society of Chemistry. Hodgkin agreed to allow her name to be used 'with some misgivings, as I find myself not quite in agreement with the segregation of women as a special kind of group in Chemistry'.