A Mass of Christian burial for Mary M. Clark, an avid Maryland horse owner and breeder, will be offered at 10 a.m. tomorrow at Sacred Heart Roman Catholic Church in Glyndon.
Mrs. Clark, who was 84, died in her sleep Thanksgiving night at Glengar farm in Glyndon, where she lived with her husband, Henry S. Clark, a well-known horse trainer, and their son, Henry S. Clark III.
A small woman of quick and generous wit, Mrs. Clark kept the accounts for her husband's horse breeding and training operation. She was well-known on the thoroughbred racetrack circuit in Maryland and from Saratoga, N.Y., to New Orleans and Miami.
She fought an energetic battle against emphysema for several years and enjoyed a hearty turkey meal that her husband and son brought her Thanksgiving Day from Laurel racetrack.
The former Mary McDonnell, Mrs. Clark was born in Altoona, Pa., where her father, Blakely McDonnell, a native of Catonsville, ownedand operated a coal mine.
She attended Mount Aloysius Junior College in Altoona and graduated from the Pennsylvania State Teacher's College. She later taught in the Altoona public school system, where she was involved in the development of education programs for mentally disabled children.
As a sportswoman in her younger years, Mrs. Clark was an accomplished tennis player, winning several Pennsylvania state championships. She took some pride in being a lifelong Pennsylvania State Doubles Champion, because the tournament she won in the 1930s was the last of its kind.
After marrying Mr. Clark 51 years ago and coming to live in Maryland, Mrs. Clark became immersed in his horse breeding and training operation, traveling up and down the East Coast and to Louisiana. She was the owner of such successful thoroughbreds as New Windsor and the recently retired Bryantown.
Mrs. Clark was a member of the Glyndon Women's Club, the LadiesAid Society, the Secular Order of Discalced Carmelites and Sacred Heart Church in Glyndon, where she worked as a substitute teacher in the church school during the 1950s and 1960s.
In addition to her husband and her son, both of Glyndon, Mrs. Clark is survived by a sister, Lizzette DeVries of Stuart, Fla.