MAYO, CHARLES HORACE (1865-1939), American surgeon, was born at Rochester, Minn., on July 19, 1865. After studying at the Rochester high school, private schools, North western university and the Chicago Medical college he began the practice of surgery at Rochester, Minn., and with his brother and father founded the Mayo Clinic. His methods had a strong influence in moulding the practice of surgery in its various depart ments as these evolved with the growth of the institution. In addition to goitre, urologic and general surgery, in all of which he excelled, his early work included operations on the eye, ear, nose and throat, and neurologic, orthopaedic, thoracic and plastic surgery. He made a special study of goitre and as a result suc ceeded in reducing the death rate in this class of cases by half. Outside of surgery, his chief interest was in focal infection and preventive medicine. He published many papers covering a wide
range of subjects, mostly surgical. He was a charter member of the American College of Surgeons. He was awarded the Dis tinguished Service Medal, U.S. Army, in 1920, and commissioned brigadier general M.O.R.C. in 1921.
Beginning with 1912, graduate courses in medicine were offered at the Mayo Clinic in Rochester. Early in 1915, Charles Mayo and his brother founded The Mayo Foundation for Medical Edu cation and Research at Rochester, and to it the brothers gave $2,800,000. By mutual agreement, the funds and resources of the foundation were placed under the direction of the regents of the University of Minnesota for promoting "graduate work in medi cine and research" and the foundation became a department of the Graduate school of the university. Dr. Mayo died May 26, 1939. (See SURGERY; MINNESOTA, UNIVERSITY OF.)