Dr. Cyrus Haymond Maxwell Jr., 85, a retired official of the U.S. Public Health Service, and a former colonel in the Army Reserve, died March 17 of respiratory failure at the Potomac Valley Nursing Home. He lived in Bethesda.

Dr. Maxwell was born in Aurora, W.Va. He graduated from the University of West Virginia and earned a master's degree in agriculture from the University of Illinois. He joined the Army Reserve in 1921 and received his medical degree from Harvard University in 1924.

He had a private practice in pediatric medicine in Auburn, N.Y., before he became chief of the Bureau of Health Services in the New York State Education Department in 1938.

He went on active duty during World War II and served in Europe, where he was commander of the 250th General Hospital in France. After the war, he returned to his work in New York.

Dr. Maxwell moved to Washington in 1948 and joined the old U.S. Office of Education as chief of administration of school and college health services. In 1950, he joined the Washington office of the American Medical Association, where he was a former associate director.

He joined the heart institute at the National Institutes of Health in 1960 and later was executive secretary of the Second National Conference on Cardiovascular Diseases. He became a Public Health officer in 1965 and retired in 1975. He retired from the Army Reserve in 1969.

He was a past president of the American School Health Association, which presented him with the William A. Howe Award. He also was a member of the D.C. Medical Society. He had been a fellow of the American Public Health Association and the American College of Preventive Medicine.

Survivors include his wife, Mattie Sparks Maxwell of Bethesda; two sons, Thomas, of Rockville, and John, of Brussels; a brother, Paul, of Menlo Park, Calif.; three grandchildren, and four great-grandchildren.