Alice Tyssowski Jones Pratt, 73, a resident of Washington for much of her life and a Red Cross Gray Lady for 30 years, died of congestive heart failure Saturday at the Wisconsin Avenue Nursing Home.

Mrs. Pratt was born in Washington.She attended the National Cathedral School for Girls and graduated from the Briarcliff school in New York.

She married Samuel Walter DuBois, a Naval officer, and accompanied him to duty stations in the Philippines, China, Hawaii and Paris. Capt. DuBois died in Paris in 1954.

His widow returned to Washington in that year and later married retired Rear Adm. L. Pratt.

She began her Red Cross career in the blood donor program in World War I. During World War II, she became a Gray Lady and continued that work until the 1970s.

She also was a member of the Chevy Chase Club, where she played in golf tournaments, the Sulgrave Club and the Washington Literary Societys. She was a member of St. David's Episcopal Church in Washington.

In addition to Adm. Pratt, survivors include three children by her first marriage, Samuel Walter DuBois, of Washington Grove, Md.; Mrs. Thomas Pritchett, of Delaplane, Va.; and Mrs. John M. McIsaac Jr., of Karlskrona, Sweden; a sister, Virginia Lee Roberts, of Delaplane: 10 grandchildren, and one great-grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the Washington Cathedral, or to the Navy Relief Society.