William Dickson Lang, Keeper of the Department of Geology in the British Museum (Natural History) from 1928-1938, died at Charmouth, Dorset, on 3 March 1966 in his 89th year. He was the second son of Edward Tickell Lang and Hebe, daughter of John Venn Prior. His father was a civil engineer, engaged at the time of the boy’s birth, at Kurnal in the Punjab on 29 December 1878, in the construction of the Jumna Canal. William was very much a product of the professional classes, all four of his grandparental branches, the Langs, Tickells, Priors and the Templers, being plentifully adorned with members of the fighting services, mostly the army—including at least two generals, and a collateral Field Marshal—the Indian Civil Service, the Church, the law and medicine, with a wealthy land-owning ancestor in the near distance, whose property had either passed to another branch or been largely dissolved by the multiplicity of descendants. His immediate relatives formed a well-knit, cultured clan whose nineteenthcentury standards and self-sufficiency were perhaps not always an advantage in dealing with a brash twentieth-century society. Lang himself summed up his ancestry thus: ‘The Langs and Tickells were very similar and homogeneous in their status, occupation and outlook, most of them entering one of the services (generally the army) and a few, the Church. It is recorded that one or two Langs showed (dilettante) artistic leanings, and one Tickell was a minor poet. None is mentioned as exhibiting a mathematical or scientific faculty; but a collateral Tickell branch threw up a naturalist. Most led straightforward and competent, if somewhat conventional, lives without exhibiting very outstanding abilities.