Articles
Reviews
Br Med J 1930; 2 doi: https://doi.org/10.1136/bmj.2.3629.142 (Published 26 July 1930) Cite this as: Br Med J 1930;2:142
This is a PDF-only article. The first page of the PDF of this article appears above.
Intended for healthcare professionals
This is a PDF-only article. The first page of the PDF of this article appears above.