Papers passed for publication in the Proceedings F W R Brambell, FRS, G P Hemmings, W A Hemmings, M Henderson and W T Rowlands, 'The route by which antibodies enter the circulation after infection of immune serum into the exocel of foetal rabbits'. F W R Brambell, FRS, W A Hemmings, M Henderson, C L Oakley and W T Rowlands, 'The accumulation of antibodies in the stomach contents of foetal rabbits'. H R Bentley, E E McDermott, and J K Whitehead, 'Action of nitrogen trichloride on proteins: II Synthesis of methionine sulphoximine and other sulphoximines'. Communicated by E C Dodds, FRS. P Nicolson and F J W Roughton, FRS, 'A theoretical study of the influence of diffusion and chemical reaction velocity on the rate of exchange of carbon monoxide and oxygen between the red blood corpuscle and the surrounding fluid'. E C Foulkes, R Lemberg, and P Purdom, 'Verdohaem and verdoglobins'. Communicated by D Keilin, FRS. October - November 1950