Scientific Opportunism L'Opportunisme scientifique

During his lifetime, Henri Poincar© published three major philosophical books which achieved great success: "La science et l'hypoth¨se" (1902), "La valeur de la science" (1905) and "Science et m©thode" (1908). After his death in 1913, a fourth volume of his philosophical works was published by his heirs as "Derni¨res pens©es" (1913). The four books constitute the core of Poincar©'s philosophic works and were given an ovation by scientific and general public. Around 1919, Gustave Le Bon wrote to Poincar©'s widow. As the director of the "Biblioth¨que de Philosophie Scientifique at Flammarion", he asked her permission to publish a second posthumous volume. "L'Opportunisme scientifique" was intended to be the fifth and final volume of Poincar©'s philosophical writings. Louis Rougier had elaborated the project, with the collaboration of Gustave Le Bon, and the approval of the philosopher mile Boutroux and his son Pierre. Because of the reservations of the mathematician's heirs, this book was never published and Derni¨res pens©es remained his last philosophical book. Nevertheless Poincar©'s correspondence - which is kept in the Poincar© Archives at University Nancy 2 - contains a large amount of documents concerning the project, its justification and the discussions between Louis Rougier and the mathematician's heirs. The aim of this book is to restore this episode, which gives some crucial informations about editorial practices of Poincar© and about the posterity of his philosophic thinking.