"for his discovery of the capillary motor regulating mechanism."
AUGUST KROGH WAS BORN AT GRENAA, IN JUTLAND, DENMARK, on November 15, 1874. He studied zoology at the University of Copenhagen, receiving the M.A. degree in 1899. Even before this, beginning in 1897, he had been carrying on research in the physiology laboratory under Christian Bohr, with whom he continued to work for some years. In 1902 he took part in an expedition to Greenland to study arctic animals. Krogh early turned his attention to studies in gaseous pressures, first in natural waters, afterward in animal physiology. His doctoral thesis (1903) dealt with the respiration of frogs. Much of his subsequent work on the pressures of oxygen and carbon dioxide in the blood was carried out in collaboration with his wife, Dr. Marie Krogh. That the affinity of blood for oxygen depends upon carbon dioxide pressure was demonstrated in 1904 by Bohr, Hasselbalch, and Krogh. In 1908 Krogh became associate in animal physiology at the University of Copenhagen, but had no laboratory until 1910 and did not become titular professor until 1916. His investigations, in some of which Lindhard was associated, were concerned chiefly with the physiology of respiration and blood circulation, but covered a wide range of interests.