Articles Letters, Notes, and Answers to Correspondents Br Med J 1891; 1 doi: https://doi.org/10.1136/bmj.1.1582.942 (Published 25 April 1891) Cite this as: Br Med J 1891;1:942 Article Related content Metrics Responses Peer review Related articles Correction Correction Published: 19 May 1956; Br Med J 1 doi:10.1136/bmj.1.4976.1188-a