Meares started research in the Cambridge Biochemical Laboratory in 1925 under M. W. Onslow subsequently taking up chemical and genetical investigations of flower colour variations with J.B.S. Haldane and R. and G. Robinson. In 1933 she moved to the John Innes Institution, Merton where she continued research until marriage ended her scientific career in the late 1930s. Forty years later Synge encouraged her to write an article about her work: 'The classical period in chemical genetics. Recollections of Muriel Wheldale Onslow, Robert and Gertrude Robinson and J.B.S. Haldane', Notes and Records of the Royal Society of London 36 (1981-1982), 125-154.
J/195-196: Correspondence with Meares and others about the preparation of the article, (1975-1981). Includes original letters (1927, 1930, 1935-1936) sent to Synge by Meares in 1979-1980.
J/197: 'Documents on the Robinsons & Bandage Chromatography'. Contents of envelope so inscribed: correspondence, 1980–1981.
J/198: Small format notebook inscribed inside front cover: '"Notes" for 'The Classical Period in Chemical Genetics'.'