This week the National Horse Show opens in Manhattan's Madison Square Garden for the 58th time. Two changes in this year's show: all proceeds will go to the U.S.O.; only two foreign countries
(Cuba and Peru) have sent teams to compete in the international military jumping events. Some of its promised features:
> Vivacious Liz Whitney, queen of show-horse equestriennes, will show her four famed huntersBon Nuit, First Night, Spring Hope and The Bearwho have won 479 ribbons this year. She hopes they can make it an even 500.
> Daredevil Margaret Cotter, Washington socialite who yips like a cowboy when she takes...