After two years of study there he entered the École des Mines in 1841 being appointed professor of elementary mathematics at the Lycée Saint-Louis in the same year.
Pagkatapos ng dalawang taon ng pag-aaral doon siya ipinasok ang École des Mines sa 1841 ay hihirangin propesor ng elementarya at matematika ang Lycée Saint-Louis sa parehong taon.