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Lavoisier was active outside of chemistry, especially in economic and farming reform. Marie became a significant collaborator: She learned English to translate important scientific papers, assisted in the laboratory, and trained in the visual arts, providing the engravings for Lavoisier's Trait é El émentaire de Chimie (1789). In 1771 he married Marie Anne Paulze, the fourteen-year-old daughter of a senior member of the Ferme. This investment would secure his fortune, but also prove his downfall. That year Lavoisier also joined the Ferme G én érale, a private company collecting indirect taxes in return for a fixed payment to the Crown. His first chemical work was a study of gypsum and plaster of Paris, which was read to the Academy of Sciences in 1765, to which he was elected in 1768. From 1763 Lavoisier assisted Guettard on field trips for the first geological survey of France. He pursued scientific interests under the guidance of the geologist Jean- Étienne Guettard (1715 –1786), a family friend, and attended Guillaume-Fran çois Rouelle's (1703 –1770) popular and influential lectures on chemistry and mineralogy at the Jardin du Roi. Lavoisier was born into a wealthy family of lawyers in 1743, and in preparation for a legal career attended the Coll ège des Quatre Nations (or Coll ège Mazarin), earning a baccalaureate in law in 1763. He is credited with establishing that oxygen is an element and water its compound with hydrogen, refining experimental methods in chemistry, reforming chemical nomenclature along systematic lines, defining element operationally, and denying phlogiston a place in chemical explanation. Antoine Lavoisier played the central role in what has come to be known as the chemical revolution.