Divorced. By Phyllis Haver Seeman, 46, bouncy, blonde bathing beauty of many an oldtime Mack Sennett custard-slinging silent film: William Seeman, 53, millionaire Manhattan wholesale grocer (White Rose brand); after 16 years of marriage; in Reno. Said she: "Bill has too much vitality. I'm getting older and want a little peace."

Divorced. Leland Stanford ("Larry'') MacPhail, 55, baseball's bleacher-lunged showman, now boss of the New York Yankees ; by Inez Thompson MacPhail, 55; after 34 years of marriage, five of separation; in Bel Air, Md.

Died. First Lieut. Augustus Van Cortlandt III, 22, only son of Manhattan socialite Augustus Van Cortlandt Jr., 51, who thus became the last surviving male of his famed old New York family (Dutch-born Olaf Van Cortlandt emigrated to Nieuw Amsterdam in 1638), which once owned 83,000 acres of New York City and Westchester County (including the Bronx' huge, sprawling Van Cortlandt Park which was sold to the city in 1889); of wounds received in battle in Germany.

Died. Marshall Headle, 52, who trained U.S. Army flyers in World War I, and as successor to the late Wiley Post as Lockheed Aircraft's top test pilot tested some 300 different types of plane (including the P-38 Lightning on its maiden flight) with out once having to bail out ; of a heart attack; in Burbank, Calif.

Died. John Munro Woolsey, 68, stocky, scholarly ex-federal judge whose pungent opinions on the legal nature of obscenity encouraged many a breezy headline; after long illness; in Manhattan. Most famed verdict, on James Joyce's Ulysses: ''Many of the words . . . characterized as dirty are old Saxon words known to almost all men and, I venture, to many women. . . . It must ... be remembered that [Joyce's] locale was Celtic and his season was spring."

Died. Bernard Flexner, 80, whose Kentucky-born brothers Abraham and Simon directed, respectively, Princeton's Institute for Advanced Study and the Rockefeller Institute for Medical Research, himself founder of the Palestine Economic Corp. for the economic rehabilitation and development of the Jewish homeland; of a heart ailment; in Manhattan.

Died. Frederic Bayley Pratt, 80, longtime head of Brooklyn's coeducational, 57-year-old Pratt Institute, which was founded by his multimillionaire father, Charles Pratt, associate of John D. Rockefeller in organizing and originally running the Standard Oil Co.; of a heart ailment ; in Glen Cove, L.I.

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