Papers passed for publication [Proceedings] Lists papers passed by the Chairman and Secretary of the Physiology Committee: R Hill, 'A method for the estimation of iron in biological material'. Communicated by Sir Frederick Hopkins, FRS. E C Smith, 'The heat of rigor of mammalian muscle'. Communicated by Sir William Hardy FRS. C Todd, 'Cellular individuality in the higher animals with special reference to the individuality of the red blood corpuscle, II'. J Mellanby, FRS, 'Prothrombase: its preparation and properties'. D Keilin, FRS, and R Hill, 'The porphyrin of component of cytochrome and its relationship to other porphyrins'. A Geiger, 'The isolation by cataphoresis of two different oxyhaemoglobins from the blood of some animals'. Communicated by H H Dale. W S Duke-Elder and P M Duke-Elder, 'The contraction of the extrinsic muscles of the eye by choline and nicotine'. Communicated by C Lovatt Evans, FRS. W Moppett, 'The differential action of x-rays on tissue, growth and vitality, II, III and IV'. Communicated by J T Wilson FRS. p40. 17 October 1930