Part of this correspondence consists of an original alphabetical series which included much of H.1-H.39. This series became disordered or partially broken up and it was not possible to reconstruct this former arrangement. The individual correspondents in each envelope are given in the following descriptions. Also included in this 'General correspondence' series are other groups of correspondence relating to various topics. The whole series has been arranged chronologically by the earliest letter in each separate envelope or bundle of correspondence. The content is scientific, professional, personal and general and is indexed. Included are letters to Bateson's wife, Beatrice, subsequent to his death.