6:30 and 9:25 P.M. are the only safe hours to hit the Keith Memorial Theater these days. At any other time you are likely to run into a foul little film called "Child of Divorce," whose buck-toothed protagonist is the most trenchant argument yet for birth control. But though the main feature involves another set of buck teeth, this time attached to Miss Tierney, they are fairly easily forgotten in the whimsical flow of this Anglicized Twentieth Century Fox picture.

Having learned how to handle ectoplasm lightly and deftly from English movies such as "Blithe Spirit" and "Stairway to Heaven," the men in the shadow of Beverly Hills have made the romance of the shade of a sea captain and a very much alive young widow, excellent and almost believable entertainment. Only the loud, artificial background music is out of place. The widow, Gene Tierney of course, is beset by all sorts of worries from beginning to end. She has no money to pay for the rent, so the captain dictates the story of his life to her, which she has published under the appropriate title of "Blood and Swash." Another time she is left in the lurch in timehonored tradition by a smooth apple of a cad. played with spirit by George Sanders. The Tierney trips through all her troubles unobtrusively enough, mouthing her dialogue in a soft, damp voice, while Rex Harrison, rough, bluff, and sentimental, steals the show as a happy inhabitant of the happy hunting grounds.

Although connoisseurs of fine motion pictures are going pale at the spectacle of J. Arthur Rank selling his artistic virtue to Hollywood's questionable standards, they may gain some encouragement from seeing our better producers learning a few things from those English. Except for the lack of a leading actress who is not a nonentity, "The Ghest and Mrs. Muir" might very well be one of the better imports seen around the Exeter Theater, and it is just possible that the American public will take this rare nectar willingly. Rex Harrison could easily be addressing the producer of the picture when he tells Gene Tierney through his beaver, "My dear, I like you. You have spunk."