Eugène-Anatole Demarçay, French chemist and academic (d. 1904)
Eugène-Anatole Demarçay (1 January 1852 – 5 March 1903) was a French chemist who designed highly specialized apparatus for use in his research. A specialist in the emerging field of spectroscopy, he detected the presence of the rare earth element europium in 1896, and isolated it as the oxide europia in 1901. He helped Marie Curie to confirm the existence of another new element, radium, in 1898.