Lastly must be mentioned the memoirs and correspondence of the period, the materials of history if not history itself. The century opened with the most famous of all these, the memoirs of the duc de Saint-Simon (1675-1755), an extraordinary series of pictures of the court of Louis XIV. and the Regency, written in an unequal and incorrect style, but with something of the irregular excellence of the great 16th-century writers, and most striking in the sombre bitterness of its tone. The subsequent and less remarkable memoirs of the century are so numerous that it is almost impossible to select a few for reference, and altogether impossible to mention all. Of those bearing on public history the memoirs of Madame de Stael (Mlle Delaunay) (1684-1750), of Pierre Louis de Voyer, marquis d'Argenson (1694-1757), of Charles Pinot Duclos (1704-1772), of Stephanie Felicite de Saint-Aubin, Madame de Genlis (1746-1830), of Pierre Victor de Besenval (1722-1791), of Madame Campan (1752-1822) and of the cardinal de Bernis (1715-1794), may perhaps be selected for mention; of those bearing on literary and private history, the memoirs of Madame d'Epinay (1726-1783), those of Mathieu Marais (1664-1737) the so-called _Memoires secrets_ of Louis Petit de Bachaumont (1690-1770), and the innumerable writings having reference to Voltaire and to the Philosophe party generally. Here, too, may be mentioned a remarkable class of literature, consisting of purely private and almost confidential letters, which were written at this time with very remarkable literary excellence. As specimens may be selected those of Mademoiselle Aisse (1694-1757), which are models of easy and unaffected tenderness, and those of Mademoiselle de Lespinasse (1732-1776) the companion of Madame du Deffand and afterwards of d'Alembert. These latter, in their extraordinary fervour and passion, not merely contrast strongly with the generally languid and frivolous gallantry of the age, but also constitute one of its most remarkable literary monuments. It has been said of them that they "burn the paper," and the expression is not exaggerated. Madame du Deffand's (1697-1780) own letters, many of which were written to Horace Walpole, are noteworthy in a very different way. Of lighter letters the charming correspondence of Diderot with Mademoiselle Voland deserves special mention. But the correspondence, like the memoirs of this century, defies justice to be done to it in any cursory or limited mention. In this connexion, however, it may be well to mention some of the most remarkable works of the time, the _Confessions_, _Reveries_, and _Promenades d'un solitaire_ of Rousseau. In these works, especially in the _Confessions_, there is not merely exhibited passion as fervid though perhaps less unaffected than that of Mademoiselle de Lespinasse--there appear in them two literary characteristics which, if not entirely novel, were for the first time brought out deliberately by