Copy letter from William Bate Hardy, Secretary of the Royal Society; to Professor [Frederick Gowland] Hopkins, Chairman of the Physiology Committee and FRS Informs Professor [Frederick Gowland] Hopkins that he has sent T. R. Parsons' 'The theory of the barcroft differential blood-gas apparatus' to Dr. [Archibald Vivian] Hill, W. A. Jolly's 'Reflex times in the south africal clawed frog' to Professor [William Maddock] Bayliss and P. T. Herring's 'The effect of thyroid-feeding and of thyroparathyroidectomy upon the pituitrin content of the posterior lobe of the pituitary, the cerebro-spinal fluid and blood' to Dr. [Henry Hallett] Dale for refereeing. 6 November 1920