MARRIED. Lord Snowdon, 48. who received his title one year after he married Britain's Princess Margaret; and Lucy Lindsay-Hogg, 37, researcher for Associated Television, who will now be known as the Countess of Snowdon; both for the second time; in London. A photographer, Antony Armstrong-Jones met Lindsay-Hogg in Australia four years ago when they worked together on a BBC documentary.

DIED. Sam Houston Johnson, 64, the late President Johnson's only brother; of cancer; in Austin, Texas. The younger Johnson worked for L.B.J. for three decades, acting, he once explained, as "baby sitter, chauffeur, political troubleshooter, administrative aide and general adviser." In 1970 he published My Brother Lyndon, in which he wrote that anyone who works for L.B.J. for more than 30 days "ought to receive a Purple Heart."

DIED. Vincent du Vigneaud, 77, winner of the 1955 Nobel Prize in Chemistry for his synthesis of two pituitary hormones; of a stroke; in White Plains, N. Y. Chairman of the biochemistry department at Cornell University Medical College, Du Vigneaud headed a team of scientists who succeeded in 1946 in synthesizing penicillin, the climax of years of work by an international task force.

DIED. Herbert Fisk Johnson, 79. longtime head of Johnson's Wax and art aficionado; of pneumonia; in Racine, Wis. "Hib," who in 1922 began to work for the company founded by his grandfather, was a pioneer in providing employee benefits; he established a pension and hospitalization plan in 1934. In 1936 he commissioned from Architect Frank Lloyd Wright a now famous office building in Racine and in 1962 invested $750,000 to buy U.S. art, which is now housed in the Smithsonian Institution.

DIED. Salvador de Madariaga, 92, erudite, witty, prolific man of letters, interpreter of Spanish culture and diplomat; in Locarno, Switzerland. When King Alfonso XIII abdicated in 1931, Madariaga became the Spanish Republic's first Ambassador to the U.S. and its delegate to the League of Nations. After the Spanish Civil War, he became an energetic opponent of Franco, living in England, broadcasting to Latin America for the BBC, and working for various international organizations. All the while he poured out--in English, French and Spanish--a torrent of political books, literary essays, novels, poems, plays, histories and biographies. (His Bolivar dubbed the great liberator "a vulgar imitator of Napoleon.") In Anarchy or Hierarchy (1937), Madariaga called for political equality but social hierarchy, since he believed that "inequality is the inevitable consequence of liberty." His decades of exile, he once told a reporter, were not too bad since, he said. "I carry Spain inside me."

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