He continued to occupy posts at the École Polytechnique, being made permanent examiner in 1840 and then, during the period 1848 until 1851, was Director of Studies.
Siya ang patuloy na maghawak posts sa École Polytechnique, na ginawa permanenteng tagasuri sa 1840 at pagkatapos, sa oras ng panahon ng 1848 hanggang 1851, ay Direktor ng Pag-aaral.