1. gay-lussac, louis joseph Frenchchemist and physicist, born at St. Leonard, Haute-Vienne; at the Polytechnic School, Paris, his abilities attracted the attention of Berthollet (q. v.), who appointed him his assistant in the governmentchemicalworks at Arcueil; here he assiduously employed himself in chemical and physical research, in connection with which he made two balloon ascents; in 1809 he became professor of Chemistry at the Paris Polytechnic School; in 1832 was elected to a similar chair at the Jardin des Plantes; seven years later was created a peer of France, while in 1829 he became chiefassayer to the Mint; his name is associated with many notable discoveries in chemistry and physics, e. g. the law of volumes, isolation of cyanogen, &c. (1778-1850).
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