(Alexis), of the French academy of sciences, was one of the most illustrious mathematicians in Europe. He read to the academy in 1726, when he was not 13 years old, "a memoir upon four new geometrical curves of his own invention;" and supported the character he thus laid a foundation for by various publications from time to time. He published, Elémens de Géométrie, 1741, in 8vo; Éléments d'Algèbre, 1746, in 8vo; Théorie de la Figure de la Terre, 1743, in 8vo; Tables de la Lune, 1754, in 8vo. He was concerned also in the Journal des Scavans, which he furnished with many excellent extracts. He died in 1765. He was one of the academicians who were sent into the north to determine the figure of the earth.