If ever a major study of the history of science should have acted like a sudden revolution it is this book, published in two volumes in 1905 and 1906 under the title, Les origines de la statique. Paris, the place of publication, and the Librairie scientifique A. Hermann that brought it be enough of a guarantee to prevent a very different out, could seem to outcome. Without prompting anyone, for some years yet, to follow up the revolutionary vistas which it opened up, Les origines de la statique certainly revolutionized Duhem's remaining ten or so years. He became the single-handed discoverer of a vast new land of Western intellectual history. Half a century later it could still be stated about the suddenly proliferating studies in medieval science that they were so many commentariesonDuhem's countlessfindings and observations. Of course, in 1906, Paris and the intellectual world in general were mesmerized by Bergson's Evolution creatrice, freshly off the press. It was meant to bring about a revolution. Bergson challenged head-on the leading dogma of the times, the idea of mechanistic evolution. He did so by noting, among other things, that to speak of vitalism was at least a roundabout recognition of scientific ignorance about a large number of facts concerning life-processes. He held high the idea of a "vital impetus passing through matter," and indeed through all matter or the universe, an impetus thatcould be detected only through intuitiveknowledge.

to the English translation of Lagrange's Mecanique Analytique Lagrange's Mecanique Analytique appeared early in 1788 almost exactly one cen- tury after the publication of Newton's Principia Mathematica. It marked the culmination of a line of research devoted to recasting Newton's synthetic, geomet- ric methods in the analytic style of the Leibnizian calculus. Its sources extended well beyond the physics of central forces set forth in the Principia. Continental au- thors such as Jakob Bernoulli, Daniel Bernoulli, Leonhard Euler, Alexis Clairaut and Jean d'Alembert had developed new concepts and methods to investigate problems in constrained interaction, fluid flow, elasticity, strength of materials and the operation of machines. The Mecanique Analytique was a remarkable work of compilation that became a fundamental reference for subsequent research in exact science. During the eighteenth century there was a considerable emphasis on extending the domain of analysis and algorithmic calculation, on reducing the dependence of advanced mathematics on geometrical intuition and diagrammatic aids. The analytical style that characterizes the Mecanique Analytique was evident in La- grange's original derivation in 1755 of the 8-algorithm in the calculus of variations. It was expressed in his consistent attempts during the 1770s to prove theorems of mathematics and mechanics that had previously been obtained synthetically. The scope and distinctiveness of his 1788 treatise are evident if one compares it with an earlier work of similar outlook, Euler's Mechanica sive Motus Scientia Analyt- 1 ice Exposita of 1736.

If ever a major study of the history of science should have acted like a sudden revolution it is this book, published in two volumes in 1905 and 1906 under the title, Les origines de la statique. Paris, the place of publication, and the Librairie scientifique A. Hermann that brought it be enough of a guarantee to prevent a very different out, could seem to outcome. Without prompting anyone, for some years yet, to follow up the revolutionary vistas which it opened up, Les origines de la statique certainly revolutionized Duhem's remaining ten or so years. He became the single-handed discoverer of a vast new land of Western intellectual history. Half a century later it could still be stated about the suddenly proliferating studies in medieval science that they were so many commentariesonDuhem's countlessfindings and observations. Of course, in 1906, Paris and the intellectual world in general were mesmerized by Bergson's Evolution creatrice, freshly off the press. It was meant to bring about a revolution. Bergson challenged head-on the leading dogma of the times, the idea of mechanistic evolution. He did so by noting, among other things, that to speak of vitalism was at least a roundabout recognition of scientific ignorance about a large number of facts concerning life-processes. He held high the idea of a "vital impetus passing through matter," and indeed through all matter or the universe, an impetus thatcould be detected only through intuitiveknowledge.

to the English translation of Lagrange's Mecanique Analytique Lagrange's Mecanique Analytique appeared early in 1788 almost exactly one cen- tury after the publication of Newton's Principia Mathematica. It marked the culmination of a line of research devoted to recasting Newton's synthetic, geomet- ric methods in the analytic style of the Leibnizian calculus. Its sources extended well beyond the physics of central forces set forth in the Principia. Continental au- thors such as Jakob Bernoulli, Daniel Bernoulli, Leonhard Euler, Alexis Clairaut and Jean d'Alembert had developed new concepts and methods to investigate problems in constrained interaction, fluid flow, elasticity, strength of materials and the operation of machines. The Mecanique Analytique was a remarkable work of compilation that became a fundamental reference for subsequent research in exact science. During the eighteenth century there was a considerable emphasis on extending the domain of analysis and algorithmic calculation, on reducing the dependence of advanced mathematics on geometrical intuition and diagrammatic aids. The analytical style that characterizes the Mecanique Analytique was evident in La- grange's original derivation in 1755 of the 8-algorithm in the calculus of variations. It was expressed in his consistent attempts during the 1770s to prove theorems of mathematics and mechanics that had previously been obtained synthetically. The scope and distinctiveness of his 1788 treatise are evident if one compares it with an earlier work of similar outlook, Euler's Mechanica sive Motus Scientia Analyt- 1 ice Exposita of 1736.