List of papers passed for publication in the Proceedings S F Jackson, 'The fine structure of developing bone in the embryonic fowl'. Communicated by J T Randall, FRS. A C R Dean and Sir Cyril Hinshelwood, PRS, 'The statistics of colony development by Bact. coli mutabile on lactose-agar'. Q H Gibson and F J W Roughton, FRS, 'The determination of the velocity constants of the four successive reactions of carbon monoxide with sheep haemoglobin'. Sir Eric Rideal, FRS, and F H Taylor, 'On haemolysis by anoinic detergents'. B C Abbott and J Lowy, 'Stress relaxation in muscle'. Communicated by F S Russell, FRS. A V Hill, FRS, 'The effect of potassium on the resting metabolism of the frog's sartorius'. p60. August - September 1956