During his lifetime, Henri PoincarA(c) published three major philosophical books which achieved great success: "La science et l'hypothA]se" (1902), "La valeur de la science" (1905) and "Science et mA(c)thode" (1908). After his death in 1913, a fourth volume of his philosophical works was published by his heirs as "DerniA]res pensA(c)es" (1913). The four books constitute the core of PoincarA(c)'s philosophic works and were given an ovation by scientific and general public. Around 1919, Gustave Le Bon wrote to PoincarA(c)'s widow. As the director of the "BibliothA]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 PoincarA(c)'s philosophical writings. Louis Rougier had elaborated the project, with the collaboration of Gustave Le Bon, and the approval of the philosopher A0/00mile Boutroux and his son Pierre. Because of the reservations of the mathematician's heirs, this book was never published and DerniA]res pensA(c)es remained his last philosophical book. Nevertheless PoincarA(c)'s correspondence - which is kept in the PoincarA(c) 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 PoincarA(c) and about the posterity of his philosophic thinking.

During his lifetime, Henri Poincare published three major philosophical books which achieved great success: "La science et l'hypothese" (1902), "La valeur de la science" (1905) and "Science et methode" (1908). After his death in 1913, a fourth volume of his philosophical works was published by his heirs as "Dernieres pensees" (1913). The four books constitute the core of Poincare's philosophic works and were given an ovation by scientific and general public. Around 1919, Gustave Le Bon wrote to Poincare's widow. As the director of the "Bibliotheque 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 Poincare's philosophical writings. Louis Rougier had elaborated the project, with the collaboration of Gustave Le Bon, and the approval of the philosopher Emile Boutroux and his son Pierre. Because of the reservations of the mathematician's heirs, this book was never published and Dernieres pensees remained his last philosophical book. Nevertheless Poincare's correspondence - which is kept in the Poincare 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 Poincare and about the posterity of his philosophic thinking."

This Festschrift is published on the occasion of Gerhard Heinzmann's 60th birthday. Its title "Construction" refers to Heinzmann's philosophical options (intuitionism, dialogical pragmatism, constructivism), as well as to his exceptional involvement in the building of many scientific enterprises and new scientific institutions.Sixty authors contributed to the volume, and the gathered essays witness the various centers of interest and intellectual achievements of Heinzmann. They are organised in five sections: (1) Henri Poincare; (2) History and Philosophy of Mathematics; (3) History and Philosophy of Logic; (4) Pragmatism; and (5) Miscellaneous.