Chronology. Introduction. 1: Ancestry. 2: Childhood in Grenna. 3: School years in Aarhus. 4: Becoming a zoologist. 5: Becoming a physiologist. 6: The beginning of zoophysiology. 7: August and Marie. 8: Marriage and the seegren prize. 9: The oxygen secretion controversy. 10: The zoophysiological laboratory and he beginning of exercise physiology. 11: Capillaries and the Nobel prize. 12: The insulin Story. 13: The happiest years. 14: Capillary function and the contractility controversy. 15: New fields of investigation. 16: Exercise physiology. 17: The introduction of isotopes. 18: Dark clouds. 19: Eile in Sweden. 20: The private laboratory in Gentofte. 21: Last scientific work.