Articles REVIEWS Br Med J 1911; 1 doi: https://doi.org/10.1136/bmj.1.2612.140 (Published 21 January 1911) Cite this as: Br Med J 1911;1:140 Article Related content Metrics Responses Peer review Related articles Erratum Erratum Published: 18 June 1904; Br Med J 1 doi:10.1136/bmj.1.2268.1434-a Correction Correction Published: 27 February 1943; Br Med J 1 doi:10.1136/bmj.1.4286.276-a