Copy letter from unknown correspondent to Professor William Maddock Bayliss FRS, Chairman of the Physiology Committee 'Paper by J F Twort and Prof L Hill FRS. "The effect of the death of pulmonary ventilation on the oxygen in the venous blood of man". Mr Barcroft's report on this paper in enclosed in original [no enclosure]. Will the Chairman please return it, with a note as to what further action should be taken.' 19 February 1915