[6] On this return to the scholastic form in Descartes, see 1st Series, vol iv., lecture 12, especially three articles of the _Journal des Savants_, August, September, and October, 1850, in which we have examined anew the principles of Cartesianism, _a propos_ the _Leibnitii Animadversiones ad Cartesii Principia Philosophiae_. [7] See on Malebranche, Spinoza, and Leibnitz, 2d Series, vol. ii., lectures 11 and 12; 3d Series, vol. iv., _Introduction aux Oeuvres Philosophiques de M. de Biran_, p. 288; and the _Fragments de Philosophie Cartesienne_, passim. [8] On Locke, see 1st Series, vol. iii., lecture 1, especially 2d Series, vol. iii., _Examen du Systeme de Locke_. [9] 1st Series, vol. iii., lectures 2 and 3. [10] 1st Series, vol. iv., lectures on the Scotch School. [11] See on Kant and the _Critique of Pure Reason_, vol. v. of the 1st Series, where that great work is examined with as much extent as that of Reid in vol. iv., and the _Essay_ of Locke in vol. iii. of the 2d Series. [12] On Fichte, 2d Series, vol. i., lecture 12; 3d Series, vol. iv., _Introduction aux Oeuvres de M. de Biran_, p. 324. [13] We expressed ourselves thus in December, 1817, when, following the great wars of the Revolution, and after the downfall of the empire, the constitutional monarchy, still poorly established, left the future of France and of the world obscure. It is sad to be obliged to hold the same language in 1835, over the ruins accumulated around us. [14] 1st Series, vol. i., Course of 1816. [15] _Ibid._, Course of 1817. [16] On the legitimate employment and the imperative conditions of eclecticism, see 3d Series, _Fragments Philosophiques_, vol. iv., preface of the first edition, p. 41, &c., especially the article entitled _De la Philosophie en Belgique_, pp. 228 and 229. [17] We have translated his excellent _Manual of the History of Philosophy_. See the second edition, vol. ii., 8vo., 1839. PART FIRST. THE TRUE. LECTURE I. THE EXISTENCE OF UNIVERSAL AND NECESSARY PRINCIPLES. Two great wants, that of absolute truths, and that of absolute truths that may not be chimeras. To satisfy these two wants is the problem of the philosophy of our time.--Universal and necessary principles.--Examples of different kinds of such principles.--Distinction between universal and necessary principles and general principles.--Experience alone is incapable of explaining universal and necessary principles, and also incapable of dispensing with them in order to arrive at the knowledge of the sensible world.--Reason as being that faculty of ours which discovers to us these principles.--The study of universal and necessary principles introduces us to the highest parts of philosophy.