Letter from Alfred Clarence Redfield, Department of Physiology, Harvard Medical School, 240 Longwood Avenue, Boston 17, Massachusetts, to Joseph Barcroft, the Physiological Laboratory, Cambridge, England Final reporting on the Peru Expedition preparations, including on letters of introduction and advice received. Grace Line arrangements are made. He provides a list of finances, with the American participants having around $1,200 each with an excess of $420 on ocean transport. He has received the x-ray apparatus from the General Electric Company and has tried it; he had bought $225 of accesories and has applied to the Elizabeth Thompson Science Fund for support and he thinks he will receive the money. The potentiometer is working and he has made measurements on blood from his radial artery and thinks that differences between the two measuring methods do not exist. Therefore he is considering leaving the potentiometer behind. He gives contact information and states that Binger is arranging gas supplies. 29 October 1921