The word that explains best Lavoisier’s scientific contribution is INNOVATION. He established the bases for modern Chemistry: the principle of mass conservation, the new nomenclature and the definition of chemical elements, alongisde the representation of the reactions using ecuations. To sum up, he was able to introduce accuracy and scientific method to this branch of science, thus refuting all the previous theories of the time, such as the phlogiston theory. He acted as a consultant for the Sociedad Bascongada in order to choose the professors for the Seminary in Bergara.