Joseph Barcroft

Sir Joseph Barcroft (26 July 1872 - 21 March 1947) was a British physiologist best known for his studies of the oxygenation of blood.

He received his degree in Medicine and Science in 1896 from Cambridge University, and immediately began his studies of hemoglobin.

In the course of his research, he did not hesitate to use himself as a test subject. For example, during the First World War, when he was called to Royal Engineers Experimental Station (near Salisbury) to carry out experiments on asphyxiating gas, he exposed himself to an atmosphere of poisonous hydrogen cyanide. On another occasion he remained for seven days in a glass chamber in order to calculate the minimum quantity of oxygen required for the survival of the human organism, and another time he exposed himself to such a low temperature that he collapsed into unconsciousness.

He also studied the physiology of oxygenation at extreme altitudes, and for this purpose he organized expeditions to the peak of Tenerife (1910), to Monte Rosa (1911), and to the Peruvian Andes (1922).

From 1925 to 1937 he held the chair of physiology at Cambridge. His final research, begun in 1933, concerned fetal respiration.

During the first years of the Second World War he was again summoned to Porton Down to consult on chemical weapons.