BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCEBr Med J 1912; 2 doi: http://dx.doi.org/10.1136/bmj.2.2699.722 (Published 21 September 1912) Cite this as: Br Med J 1912;2:722
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial