Articles Reports of Medical and Surgical Practice in the Hospitals of Great Britain Br Med J 1873; 2 doi: https://doi.org/10.1136/bmj.2.674.631 (Published 29 November 1873) Cite this as: Br Med J 1873;2:631 Article Related content Metrics Responses Peer review Related articles Correction Corrigendum: Crookes's Dark-adaptation Tester Published: 23 November 1940; Br Med J 2 doi:10.1136/bmj.2.4168.730