Papers passed for publication [Proceedings] Lists papers passed by the Chairman and Secretary of the Physiology Committee: A Graham, 'On the optimum hydrogen ion concentration and temperature of the style enzyme of pecten maximus'. Communicated by E J Allen, FRS. E B R Prideaux, 'The combination curves, hydrogen ion regulating power and dissociation constants of gelatin'. Communicated by F S Kipping, FRS. C H Lea, 'The effect of light on the oxidation of fats'. Communicated by Sir William Hardy. A V Hill, FRS, and J L Parkinson, 'Heat and osmotic change in muscular contraction without lactic acid formation'. F G Spear, 'The delayed lethal effect of radium on tissue cultures in vitro - comparison of continuous and spaced radiation'. Communicated by Sir Frederick Andrewes, FRS. p44. 2 March 1931