The author describes the influence on the Enlightenment of the intellectual currents that had been active in France, particularly the historical and humanistic esprit critique and the scientific esprit moderne. The second volume probes the writings of Morelly, Helvetius, Holbach, Mably, and Condorcet as they reveal the transformation of the esprit philosophique into the esprit revolutionnaire. Originally published in 1978. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.