Throughout her life, Diana Trilling (1905-1996) wrote about profound social changes with candor and wisdom, first for The Nation and later for Partisan Review, Harpers, and such popular magazines as Vogue and McCalls. She went on to publish five books, including the best-selling Mrs. Harris: The Death of the Scarsdale Diet Doctor, written when she was in her late seventies. She was also one half of one...