Articles British Medical Association Br Med J 1906; 2 doi: https://doi.org/10.1136/bmj.2.2394.1394 (Published 17 November 1906) Cite this as: Br Med J 1906;2:1394 Article Related content Metrics Responses Peer review Related articles Correction Corrections Published: 05 December 1964; Br Med J 2 doi:10.1136/bmj.2.5422.1449-a