(Paris, Gauthier-Villars), 1897. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 124, No 9. Pp. (429-) 480. (Entire issue offered). Becquerel's paper: pp. 438-444. A small tear to inner lower margin. Disbound.
First printing. In 1896 Becquerel made his landmark discovery of radioactivity and in this follow-up paper he further established some of the properties of the radiation so that it could be identified unambiguously.
Order-nr.: 49452