[3] But his progress was so rapid that in two or three years he was able to take his master's place at the lecture-table, and Fourcroy and Vauquelin were so satisfied with his performance that they procured for him a school appointment in 1797 as a teacher of chemistry, and in 1798 one as répétiteur at the École Polytechnique.

[4] In 1804 Vauquelin resigned his professorship at the Collège de France and successfully used his influence to obtain the appointment for Thénard, who six years later, after Fourcroy's death, was further elected to the chairs of chemistry at the École Polytechnique and the Faculté des Sciences.

From 1827 to 1830 he represented the département of Yonne in the chamber of deputies, and as vice-president of the conseil superieur de l'instruction publique, he exercised a great influence on scientific education in France.

Like most great teachers he published a textbook, and his Traité de chimie élémentaire, théorique et pratique (4 vols., Paris, 1813–16), which served as a standard for a quarter of a century, perhaps did even more for the advance of chemistry than his numerous original discoveries.

[4] Soon after his appointment as répétiteur at the École Polytechnique he began a lifelong friendship with Joseph Louis Gay-Lussac, and the two carried out many research projects together.