Letter from Francis John Worsley Roughton, regarding a series of papers by Archibald Vivian Hill, and an obituary for Joseph Barcroft Sectional Committee: Physiology and Medical Sciences Suggests devoting a session of the Royal Society to hearing from the author himself on the series of works. Criticises the use of the term 'heat of activation', but notes that 'energy of activation' has been used in physical chemistry, on which the author might like to add a discussion and analogy. Suggests giving a brief description of the protected thermophile, as the papers referenced are from before the war and may not be readily available to foreign readers. Has not yet finished reading the paper 'Myothermic methods'. The obituary for Joseph Barcroft has been delayed by editing his Memorial Book. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 6 November 1948. Papers under discussion: 'Work and heat in a muscle twitch' 'On the time required for diffusion and its relation to processes in muscle' 'The heat of activation and the heat of shortening in a muscle twitch' 'Myothermic methods' 'The onset of contraction' 'The energetics of relaxation in a muscle twitch' 'The abrupt transition from rest to activity in muscle' 'Joseph Barcroft, 1872-1947', in Biographical Memoirs of Fellows of the Royal Society 5 November 1948