Paris, Gauthier-Villars, 1899. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 129, No 19, 20 a. 21). Pp. (687-) 853. (3 entire issues offered). The papers: pp. 714-716, 716-717, 760-762 a. 823-825. All three issues clean and fine.
First apperance of 4 importent papers on the newly discovered phenomena of radioactivity.