Notes on papers passed for publication in the Proceedings R W Cox and K Little, 'An electron microscope study of elastic tissue'. R Lemberg, FRS, D B Morell, N Newton and J E O'Hagan, 'Haem a compounds as models for cytochromes of group a: absorption spectra of haem a compounds with proteins and other nitrogenous liquids'. R Lemberg, FRS, N Newton and J E O'Hagan, 'Haem a compounds as models for cytochromes of group a: absorption spectra of haem a compounds with detergents'. R Lemberg, FRS, and N Newton, 'Haem a compounds as models for cytochromes of group a: Schiff's bases of haem a and other formylhaems and formyl-porphyrins'. J E M Midgley and Sir Cyril Hinshelwood, FRS, 'Lag, adaptation and ageing in a micro-organism'. J E M Midgley and Sir Cyril Hinshelwood, FRS, 'The stability of an adaptive enzyme formed during growth of Bact. lactis aerogenes in D-arabinose: complex history of the adaptive changes'. J E M Midgley and Sir Cyril Hinshelwood, FRS, 'The stability of an adaptive enzyme formed during growth of Bact. lactis aerogenes in D-arabinose: reversion phenomena'. C G Butler, R K Callow FRS, and Norah C Johnston, 'The isolation and synthesis of queen substance, 9-oxodec-2-enoic acid, a honeybee pherome'. K E Machin, J W S Pringle FRS, and M Tamasige, 'The physiology of insect fibrillar muscle: the effect of temperature on a beetle flight muscle'. 1961