List of papers passed for publication in the Proceedings I M Dawson, J Hossack and G M Wyburn, 'Observations on the Nissl's substance, cytoplasmic filaments and the nuclear membrane of spinal ganglion cells'. Communicated by J M Robertson, FRS. A C R Dean and Sir Cyril Hinschelwood, For Sec RS, 'the rate of development of colonies of Bact lactis aerogenes on agar plates containing drugs'. D B Amos, P A Gorer, Z B Mikulska, 'An analysis of an antigenic system in the mouse (the H-2 system). Communicated by R R Race, FRS. A S Parkes, FRS, 'Viability of adrenocortical tissue transplanted after freezing and thawing'. R Barter, J F Dannielli and H G Davies, 'A quantitative cytochemical method for estimating alkaline phosphate activity'. Communicated by J T Randall, FRS. R Halliday, 'Prenatal and postnatal transmission of passive immunity to young rats'. Communicated by F W R Brambell, FRS. p51. April - July 1955