Articles Reports of Societies Br Med J 1861; 2 doi: https://doi.org/10.1136/bmj.2.28.31 (Published 13 July 1861) Cite this as: Br Med J 1861;2:31 Article Related content Metrics Responses Peer review Related articles Correction Corrigendum Published: 13 July 1940; Br Med J 2 doi:10.1136/bmj.2.4149.68-b