MAYO, Charles Horace, American sur geon: b. Rochester, Minn., 19 July 1865. He was educated at the Rochester High School, Northwestern University, and in was grad uated in medicine at the Chicago Medical Col lege. In the same year he entered on the prac tice of medicine at Rochester, where he has since resided. He has received the following honorary degrees: A.M., Northwestern Univer sity, 1902; LL.D., University of Maryland, 1909; F.A.C.S., American College of Surgeons, 1913; LLD., Kenyon College, 1916; DSc., Princeton University, 1917. Dr. Mayo is surgeon to the Mayo Clinic of Saint Mary's Hospital, Roches ter, Mimi.; to the Mayo Foundation, University of Minnesota, where he has been professor of surgery since 1915. In 1913 he was commis sioned first lieutenant in the Medical Reserve Corps, United States Army; was appointed major in 1917, and colonel in the same corps in 1918. In the same year he was made asso ciate chief consultant of the United States Army Medical Department for Surgical Services. He is also consulting surgeon of the Chicago and Northwestern Railway and of the Chicago Great Western Railway. Dr. Mayo is a member of the American Medical Association, of which he was president in 1916-17 and chairman of the section on surgery. in 1910; of the American
Surgical Association; of the Association of Military Surgeons of the United States; of the Clinical Congress of the American College of Surgeons (president in 1914-15) ; of the Minne sota State Medical Society, of which he was president in 1905; of the Society of Clinical Surgery; of the Southern Surgical and Gyne cological Society; of the Western Surgical and Gynecological Society, of which he was presi dent in 1904-05; of the Council of National Defense Medical Board; of the National Medi cal Museum; of the Minnesota Pathological Society; of the American Association of Rail way Surgeons; of the American Association for the Advancement of Science; etc.; etc. In 1908-09 he was president of the section on surgery of the International Congress on Tuber culosis. In 1915, with his brother, W. J. Mayo (q.v.), he donated $1,500,000 to establish the Mayo Foundation for Medical Education and Research at Rochester, in affiliation with the University of Minnesota.