NOTE ON PREVIOUS FINDING AID In 1964 William Coleman selected a quantity of Bateson's manuscripts, then in the USA, and produced an inventory. Shortly afterwards he microfilmed the manuscripts (see W. Coleman, 'Bateson Papers', in The Mendel Newsletter No.2, November 1968). In 1975 A.G. Cock of Southampton University gained permission from Bateson's son, Gregory, to take the papers back to the UK, transferring them after listing to Cambridge University Library. He retained the numbering from Coleman's microfilm reels and sections, also preserving Coleman's physical arrangement of the archive (see A.G. Cock, 'The William Bateson Papers', in The Mendel Newsletter, No.14, June 1977). This numbering system was used as a finding aid to the archive in Cambridge University Library before the production of this catalogue. These alpha-numeric references to the envelopes and files that originally contained the papers have been included in this catalogue: they appear in the former reference field, e.g. G.7.m. The collection was renumbered for a second time in 2018 during re-cataloguing for digitisation.