BECQUEREL, Antoine Henri (1852-1908). Recherches sur une Propriété nouvelle de la Matière, Paris: Firmin-Didot, 1903, 4°, FIRST SEPARATE EDITION, 13 plates, illustrations (leaves lightly browned), canvas-backed marbled boards (spine slightly faded), sprinkled edges, bookplate of A. R. Michaelis. [Dibner 163; Norman 159: "an extended memoir of Becquerel's investigations in radioactivity"; PMM 393].