Radio: Program Preview, Dec. 19, 1949

For the week starting Friday, Dec. 16. Times are E.S.T., subject to change.

We, the People (Fri. 8:30 p.m., NBC and NBC-TV). Guests: General George C. Marshall, Diana Lynn.

Ford Theater (Fri. 9 p.m., CBS-TV). Little Women, with Peggy Ann Garner, Meg Mundy, June Lockhart.

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

Invitation to Learning (Sun. noon, CBS). Thomas Wolfe's You Can't Go Home Again.

New York Philharmonic (Sun. 3 p.m., CBS). Violin soloist: Joseph Szigeti.

Philco Television Playhouse (Sun. 9 p.m., NBC-TV). Margaret Cousins' The Strange Christmas Dinner, with Melvyn Douglas and Leo G. Carroll.

The Joyful Hour (Sun....