The idealism of Berkeley, as was to be expected from the nature of the case, remained without any farther development, but the philosophy of Leibnitz was taken up and subjected to a farther revision by _Christian Wolff_. He was born in Breslau in 1679. He was chosen professor at Halle, where he became obnoxious to the charge of teaching a doctrine at variance with the Scriptures, and drew upon himself such a violent opposition from the theologians of the university, that a cabinet order was issued for his dismissal on the 8th of November, 1723, and he was enjoined to leave Prussia within forty-eight hours on pain of being hung. He then became professor in Marburg, but was afterwards recalled to Prussia by Frederic II. immediately upon his accession to the throne. He was subsequently made baron, and died 1754. In his chief thoughts he followed Leibnitz, a connection which he himself admitted, though he protested against the identification of his philosophy with that of Leibnitz, and objected to the name, _Philosophia Leibnitio-Wolffiana_, which was taken by his disciple Bilfinger. The historical merit of Wolff is threefold. First, and most important, he laid claim again to the whole domain of knowledge in the name of philosophy, and sought again to build up a systematic framework, and make an encyclopedia of philosophy in the highest sense of the word. Though he did not himself furnish much new material for this purpose, yet he carefully elaborated and arranged that which he found at hand. Secondly, he made again the philosophical method as such, an object of attention. His own method is, indeed, an external one as to its content, namely, the mathematical or the mathematico-syllogistical, recommended by Leibnitz, and by the application of this his whole philosophizing sinks to a level formalism. (For instance, in his principles of architecture, the eighth proposition is—“a window must be wide enough for two persons to recline together conveniently,”—a proposition which is thus proved: “we are more frequently accustomed to recline and look out at a window in company with another person than alone, and hence, since the builder of the house should satisfy the owner in every respect (§ 1), he must make a window wide enough for two persons conveniently to recline within it at the same time”.) Still this formalism is not without its advantage, for it subjects the philosophical content to a logical treatment. Thirdly, Wolff has taught philosophy to speak German, an art which it has not since forgotten. Next to Leibnitz, he is entitled to the merit of having made the German language for ever the organ of philosophy.