Parcieux

, or rather Deparcieux (Anthony), an able mathematician, was born in 1703, at a hamlet near Nismes, of industrious but poor parents, who were unable to give him education; he soon, however, found a patron, who placed him in the college at Lyons, where he made astonishing progress in mathematics. On his arrival at Paris, he was obliged to accept of humble employment from the mathematical instrument makers, until his works brought him into notice. These were, 1. “Table astronomiques,” 1740, 4to. 2. “Traite” de trigonometric rectiligne et spherique, avec un trait6 de gnomonique et des tables de logarithmes,“1741, 4to. 3.” Essai sur les probabilites de la dnre de la vie humame,“1746, 4to. 4.” Reponse aux objections contrtr ce livre,“1746, 4to. 5.” Additions a I’essai, c.“1760, 4to. 6.” Memoires sur la possibility et la facilit^ d‘amener aiipres de PEstrapade, a Paris, les eaux de la riviere d’Yvette,“1763, 4to, reprinted, with additions, in 1777. It was always Deparcieux’s object to turn his knowledge of mathematics to practical purposes, and in the memoirs of the academy of sciences are many excellent papers which he contributed with this view. He also introduced some ingenious improvements in machinery. He was censor- royal and member of the academy of sciences at Paris, and of those of Berlin, Stockholm, Metz, Lyons, and Montpelher. He died at Paris Sept. 2, 1768, aged sixty-five. He had a nephew of the same name, born in 1753, who was educated at the college of Navarre at Paris, where he studied mathematics and philosophy, and at the age of twentyfour gave public lectures. In 177y he began a course of experimental philosophy, in the military school of Brienne; after which, he occupied the philosophical professorship at the Lyceum in Paris, where he died June 23, 1799, in a state bordering on indigence. He wrote a” Traité elementaire de Mathematiques,“for the use of students; | ”Traite* des annuites, ou des rentes a terme,“1781, 4to” Dissertation snr le moyen d‘elever l’eau par la rotation d’une curde verticale sans fin,“Amst. 1782, 8vo” Dissertation sur ies globes areostatiques,“Paris, 1783, 8vo. He left also some unfinished works; and a” Cours complet de physique et de chimie," was in the press when he died. ¹