Notes on papers passed for publication in the Proceedings C J Duncan and P M Sheppard, 'Continuous and quantal theories of sensory discrimination'. D E Broadbent and Margaret Gregory, 'Division of attention and the decision theory of signal detection'. B Morris, 'The selection of antibodies by the gut of the young hedgehog'. F R Batchelor, J Cameron-Wood, E B Chain FRS and G N Rolinson, 'Studies on penicillinase produced by a strain of Staphyloccus aureus'. V T Marchesi and J L Gowans, 'The migration of lumphocytes through the endothelium of venules in lymph nodes: an electron microscope study'. J L Gowans and E J Knight, 'The route of recirculation of lymphocytes in the rat'. T G Baker, 'A quantitative and cytological study of germ cells in human ovaries'. Elsie M Widdowson and R A McCance FRS, 'The effect of finite periods of undernutrition at different ages upon the composition and subsequent development of the rat'. p64. March 1963