Notes on papers passed for publication in the Proceedings R A McCance, FRS, and E M Widdowson, 'Renal function before birth'. N A Michison, 'Passive transfer of transplantation immunity'. Communicated by J B S Haldane, FRS. A V Hill, FRS, 'The plateau fo full activity during a muscle twitch'. A V Hill, FRS, 'A reinvestigation of two critical points in the energies of muscular contraction'. Megan Henderson, 'Foetal regression in rabbits; experimental studies of histolysis and phagocytosis'. Communicated by F W R Brambell FRS. A A Eddy and Sir Cyril Hinshelwood, For Sec RS, 'Further observations on galactose adaptation of yeast strains'. E A Irving and S G Tomlin, 'Collagen, reticulum and their argyrophilic properties'. Communicated by J T Randall, FRS. T Mann, FRS, 'On the presence and role of inositol and certain other substances in the seminal vesicle secretion of the boar'. A P D Thomson, 'The onset of oestrus in normal and blinded ferrets'. Communicated by S Zuckerman, FRS. A C R Dean and Sir Cyril Hinshelwood, For Sec RS, 'The stability of various adaptations of Bact lactis aerogenes'. p39. May - October 1953