During the Restoration, Bacon was commonly invoked as a guiding spirit of the Royal Society founded under Charles II in 1660. During the 18th-century French Enlightenment, Bacon's non-metaphysical approach to science became more influential than the dualism of his French contemporary Descartes, and was associated with criticism of the "Ancien Régime". In 1733 Voltaire introduced him to a French audience as the "father" of the scientific method, an understanding which had become widespread by the 1750s. In the 19th century his emphasis on induction was revived and developed by William Whewell, among others. He has been reputed as the "Father of Experimental Philosophy".