POINCARÉ (Raymond). On the dynamics of the electron. [Paris : Gauthiers-Villars, 1905]. - In-4, blue calf with bradel, smooth spine (modern binding). Pre-original edition of the communication read by Raymond Poincaré at the Académie des sciences during the session of June 5, 1905, on his work on "The dynamics of the electron". He indicated the bases and the main results of his work. This is the first draft of the founding text of Relativity. Poincaré developed it the following month in a 47-page memoir that was published in January 1906. This booklet is extracted from the volume CXL (140) of the "Comptes rendus hebdomadaires des séances de l'Académie des sciences" published by Gauthier-Villars in 1905, occupying pages 1497 to 1572. It concerns only the session of June 5, 1905. The communication of Poincaré appears on pages 1504 to 1508. There are also papers by Berthelot on thermochemistry, by Lippmann on photography, by Moissan and Martinsen on mineral chemistry, by Laveran and Vallée on pathology, by Charles Depéret on paleontology, by Colin on physical geography, by Léger on aeronautics, etc. Good copy in modern binding. Dark marks on the second cover.