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an eminent French Inathematician and astronomer, was born at Rumigiiy

, an eminent French Inathematician and astronomer, was born at Rumigiiy in the diocese of Rheims on March 15, 1713. His father having quitted the army, in which he had served, amused himself in his retirement with studying mathematics and mechanics, in which he proved the author of several inventions of considerable use to the public. From this example of his father, our author “almost in his infancy took a fancy to mechanics, which proved of signal service to him in his maturer years. At school he discovered early tokens of genius. He came to Paris in 1729; where he studied the classics, philosophy, and mathematics, and afterwards divinity in the college de Navarre, with a view to the church, but he never entered into priest’s orders, apprehending that his astronomical studies, to which he had become much devoted, might too much interfere with his religious duties. His turn for astronomy soon connected him with the celebrated Cassini, who procured him an apartment in the observatory; where, assisted by the counsels of this master, he soon acquired a name among the astronomers, in 1739 he was joined with M. Cassini de Thury, son to M. Cassini, in verifying the meridian through the whole extent of France; and in the same year he was, named professor of mathematics in the college of Mazarine. In 1741 or author was admitted into the academy of sciences as an adjoint member for astronomy and had many excellent papers inserted in their memoirs; beside which he published several useful treatises, viz. Elements of Geometry, Astronomy, Mechanics, and Optics. He also carefully computed all the eclipses of the sun and moon that had happened since the Christian sera, which were printed in the work entitled” L'Art de verifier les dates,“&c. Paris, 1750, 4to. He also compiled a volume of astronomical ephemerides for the years 1745 to 1755; another for the years 1755 to 1765 and a third for the years 1765 to 1775 as also the most correct solar tables of any; and an excellent work entitled” Astronomic fundamenta novissimis solis et stellarum observationibus stabilita."