Scientific Opportunism L���Opportunisme scientifique

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