List of papers passed for publication in the Proceedings Q H Gibson and F J W Roughton, FRS, 'The kinetics of dissociation of the first ligand molecule from fully saturated carboxyhaemoglobin and nitric oxide haemoglobin in sheep blood solutions'. L R Fisher, S K Kon and P A Plack, 'Vitamin A isomers in some eucaridal Crustacea'. Communicated by H D Kay, FRS. A C R Dean and Sir Cyril Hinschelwood, FRS, 'The formation of papillae on bacterial colonies. I'. A C R Dean and Sir Cyril Hinschelwood, FRS, 'The formation of papillae on bacterial colonies. II'. A V Hill, FRS and J V Howarth, 'The effect of potassium on the resting metabolism of the frogs' sartorius'. R Halliday, 'The production of antibodies by young rats'. Communicated by F R W Brambell, FRS. p71. 20 March 1957