Edward C. Jandy, 81, a professor of sociology and criminology at Wayne State University in Detroit for 35 years who later taught in Maryland, died of cancer Monday at Montgomery General Hospital in Olney.

Dr. Jandy began his career in education as an instructor at the University of Michigan, where he earned a master's degree in psychology and doctorate in sociology. In 1930, he became a full professor at Wayne State University.

Following his retirement in 1965, he moved to this area and taught part-time at Montgomery College and at the University of Maryland until 1975.

From 1945 to 1947, while on leave from his teaching position, he served as welfare director of the U.N. Relief and Rehabilitation Administration (UNRRA) mission to Ethiopia. He returned to Ethiopia in 1950, and spent three years there as attache and public affairs officer at the U.S. Embassy. t

He was a Fulbright lecturer at the University of Karachi in West Pakistan in 1956 and 1957.

Dr. Jandy wrote a biography of the noted U.S. sociologist Charles Horton Cooley, "Charles Horton Colley: His Life and His Social Theory," published in 1942 by Dryden Press. The book later was reprinted by Octagon Press.

He was a former lecturer at the Michigan Police Academy and a former chairman of the Michigan State Commission on Prisons, Pardons and Paroles.

Dr. Jandy was born in Chicago and earned a bachelor's degree from Hillsdale College in Michigan. He received his high school education at Blackburn Junior College in Carlinville, Ill., now Blackburn College, which awarded him its first alumni achievement award in 1978. He received an alumni achievement award from Hillsdale College in 1955.

He lived in Adelphi and taught study courses on religions of the world and current events at the Good Shepherd United Methodist Church in Silver Spring. He was a former vice president of the Adelphi Citizens Association.

Survivors include his wife of 54 years, Lorene Smith Jandy of Adelphi; two daughters, Laural Aird of Silver Spring and Gail Livingstone of Davidsonville, Md.; two foster sons, Carl Shaw of Corte Madera, Calif., and Douglas Howell of Seattle; two sisters, Rose Eppers and Bess Waalk, both of Chicago; five grandchildren, 11 foster grandchildren and a great grandson.

The family suggests that expressions of sympathy be in the form of contributions to Good Shepherd Church or to the Montgomery County Chapter of the American Cancer Society.