Articles Reviews Br Med J 1929; 2 doi: https://doi.org/10.1136/bmj.2.3585.540 (Published 21 September 1929) Cite this as: Br Med J 1929;2:540 Article Related content Metrics Responses Peer review Related articles Correction The Theory of Emulsions: A Correction Published: 26 September 1936; Br Med J 2 doi:10.1136/bmj.2.3951.656-a See more Hip pain in a middle aged woman BMJ November 30, 2016, 355 i6129; DOI: https://doi.org/10.1136/bmj.i6129 Should adults take vitamin D supplements to prevent disease? BMJ November 23, 2016, 355 i6201; DOI: https://doi.org/10.1136/bmj.i6201 NHS spent 8% more on medicines last year BMJ November 23, 2016, 355 i6320; DOI: https://doi.org/10.1136/bmj.i6320 A swollen painful foot BMJ November 02, 2016, 355 i5418; DOI: https://doi.org/10.1136/bmj.i5418 General practices achieve 95% of QOF points BMJ October 28, 2016, 355 i5834; DOI: https://doi.org/10.1136/bmj.i5834