Papers passed for publication in the Proceedings Lord Rothschild, FRS, 'Anaerobic heat production of bull spermatozoa: the effects of changes in the colligative and other properties of the suspended medium'. A V Hill, FRS and J V Howarth, 'The reversal of chemical reactions in contracting muscle during an applied stretch'. Tsoo E King and T Mann, FRS, 'Sorbitol metabolism in spermatozoa'. A Loveless and Jocelyn C Stock, 'The influence of radiomimetic substances on deoxyribonucleic acid synthesis and function studied in E coli phage systems.' D B Cater, G A Silver and G M Wilson, 'Apparatus and technique for the quantitative measurement of oxygen tension in living tissues'. D E Broadbent and P Ladefoged, 'Vowel judgements and adaptation level'. p22. 1959