Program Preview

For the week starting Friday, Dec. 10. Times are E.S.T., subject to change.

Metropolitan Opera (Sat. 2 p.m., ABC). Tristan und Isolde, with Helen Traubel and Lauritz Melchior.

Invitation to Learning. (Sun. 12 noon, CBS.) G.I. Cartoonist Bill Mauldin discusses Eisenhower's Crusade in Europe.

RCA Victor Show (Sun. 5:30 p.m., NBC). Arthur Fiedler and the Boston Pops Orchestra, with Baritone Robert Merrill. Premiere.

Studio One (Sun. 7:30 p.m., CBS-TV). Gian-Carlo Menotti's opera The Medium, starring Marie Powers.

Talent Scouts (Mon. 8:30 p.m., CBS-TV). Arthur Godfrey moves into TV.

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