The ‘philosophes’ and others who contributed to and otherwise supported the Encyclopédie, published in France in 35 volumes between 1751 and 1780, one of the great literary achievements of the 18th century. It was a complete review of the arts and sciences of the day, explaining the new physics and cosmology and proclaiming a new philosophy of humanism. It was edited by Denis Diderot (1713–84) and Jean le Rond d’Alembert (1717–83) with important articles contributed by Voltaire (1694–1778), Montesquieu, Rousseau, and George Buffon (1707–88). A decree of 1752 suppressed the first volumes and in 1759 it was placed on the Index (of books forbidden to Roman Catholics), but it continued to circulate. The critical attitudes fostered by the Encyclopédie are believed to have contributed to the French Revolution.