text: Frémy was born at Versailles, entered Joseph Louis Gay-Lussacs laboratory in 1831, and was employed at the École Polytechnique in 1834 and at the Collège de France in 1837. His next post was that of repetiteur at the École Polytechnique, where in 1846 he was appointed professor, and in 1850 he succeeded Gay-Lussac in the chair of chemistry at the Muséum national dhistoire naturelle, of which he later became director (1879–1891) after Michel Eugène Chevreul. He died in Paris.