Opening tomorrow at the University Theatre and coupled with three W.C. Fields shorts is Buster Keaton's silent classic "The General." Above is a scene from Fields' "The Dentist." The films will play for three days and will be followed by one of Charlie Chaplin's neglected masterpieces, "The Circus." Film buffs and pleasure seekers alike should avoid missing a rare treat — not only are the films funny, but several are important experimental material of early cinema.