[Footnote 1: The author of a notice of Leibnitz, more clever than profound, in four numbers of the _Gentleman's Magazine_ for 1852, distinguishes between capacity and faculty. He gives his subject credit for the former, but denies his claim to the latter of these attributes. As if any manifestation of mind were more deserving of that title than the power of intellectual concentration, to which nothing that came within its focus was insoluble.] A collection of all the works appertaining to Leibnitz, with all his own writings, would make a respectable library. We have no room for the titles of all, even of the more recent of these publications. We content ourselves with naming the Biography, by G. G. Guhrauer, the best that has yet appeared, called forth by the celebration, in 1846, of the ducentesimal birthday of Leibnitz,--the latest edition of his Philosophical Works, by Professor Erdmann of Halle--the publication of his Correspondence with Arnauld, by Herr Grotefend, and of that with the Landgrave Ernst von Hessen Rheinfels, by Chr. von Rommel,-- of his Historical Works, by the librarian Pertz of Berlin,--of the Mathematical, by Gerhardt,--Ludwig Jeuerbach's elaborate dissertation, "Darstellung, Entwickelung und Kritik der Leibnitzischen Philosophie,"-- Zimmermann's "Leibnitz u. Herbart's Monadologie,"--Schelling's "Leibnitz als Denker,"--Hartenstein's "De Materiae apud Leibnit. Notione,"--and Adolph Helferich's "Spinoza u. Leibnitz: oder Das Wesen des Idealismus u. des Realismus." To these we must add, as one of the most valuable contributions to Leibnitian literature, M. Foucher de Careil's recent publication of certain MSS. of Leibnitz, found in the library at Hanover, containing strictures on Spinoza, (which the editor takes the liberty to call "Refutation Inédite de Spinoza,")--"Sentiment de Worcester et de Locke sur les Idées,"-- "Correspondance avec Foucher, Bayle et Fontenelle,"--"Reflexions sur l'Art de connaître les Homines,"--"Fragmens Divers," etc. [2], accompanied by valuable introductory and critical essays. [Footnote 2: A second collection, by the same hand, appeared in 1857, with the title, _Nouvelles Lettres et Opuscules Inédits de Leibnitz_. Précédés d'une Introduction. Par A. Foucher de Careil. Paris. 1857.]