Letter from H. D. Yates, the Peruvian Corporation, 43-46 Threadneedle Street, London, to Joseph Barcroft, Physiological Laboratory, Cambridge Mr. Bury gives thanks for Barcroft's letter and Yates sends half a dozen booklets on the Central Railway of Peru, all that can be spared at present. No charge is being made and Yates returns Barcroft's cheque for 10 shillings. Mr Bury will reply to Barcroft's enquiry about the amount of electric current. 16 June 1921