BORN. To Paul McCartney, 35; owl-eyed Beatle, songwriter (Yesterday) and pilot of Wings, his highflying, soft-rock group, and Linda Eastman McCartney, 35, singer and photographer: their third child, first son; in London. Name: James Louis.

MARRIED. Glenn Ford, 61, strong-jawed, soft-spoken Hollywood good guy; and Actress Cynthia Hayward, 30, his companion for three years; he for the third time, she for the second; in Beverly Hills, Calif.

DIVORCED. Hayley Mills, 31, star of kiddie cinema (Pollyanna, The Parent Trap) who rounded nicely into adult roles (The Family Way, Twisted Nerve); and Roy Boulting, 63, British producerdirector; after six years of marriage, one son; in London. The suit alleging Mills' adultery with Actor Leigh Lawson was uncontested.

DIED. Maria Callas, 53, tempestuous diva known for her theatrics onstage and off: of a heart attack; in Paris (see Music).

DIED. William M. Magruder, 54, crew-cut former test pilot who headed the federal su personic transport program; of a heart attack; in Winston-Salem, N.C. Magruder was a test pilot for the B-52 bomber and played a major role in developing the L-1011 airbus. Although he argued forcefully for the SST, the program was defeated in 1971, and he became a special technology consultant to President Nixon, spurring increased Government fund- ing for mass transit, energy research and highway safety projects. In 1973 Magruder resigned to become executive vice president of Piedmont Aviation, Inc.

DIED. Robert Lowell, 60, Pulitzer prizewinning poet whose introspective verse bared his own tortured confrontations with religion, mental illness and domestic problems; of an apparent heart attack; while en route by taxi from Kennedy International Airport to Manhattan (see BOOKS).

DIED. Arnold Brecht, 93, Prussian official who defied Hitler in the last free speech given in Germany's parliament; while vacationing in Eutin, West Germany. In 1933, when Hitler made his first address to the legislature, Brecht, who represented the largest state, made the reply. Brecht reminded the newly appointed Chancellor of Hitler's oath to abide by the constitution and the law of the land. Hitler stalked out of the meeting and four days later dismissed Brecht. Emigrating to America, Brecht joined the "university in exile," a haven for refugee professors at New York's New School for Social Research where he taught international law, political science and public finance.

DIED. Leopold Stokowski, 95, irreverent, in novative conductor whose career spanned 70 years and some 7,000 concerts; of a heart attack; in Nether Wallop, England (see MUSIC).

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