Seated in an arm-chair, with our feet on the fender, we see little by little, as we turn over the leaves of the book, an animated and thoughtful face arise before us; the countenance assumes expression and clearness; the different features are mutually explained and lightened up; presently the author lives again for us, and before us; we perceive the causes and birth of all his thoughts, we foresee what he is going to say; his bearing and mode of speech are as familiar to us as those of a man whom we see every day; his opinions correct and affect our own; he enters partly into our thoughts and our life; he is two hundred leagues away, and his book stamps his image on us, as the reflected light paints on the horizon the object from which it is emitted. Such is the charm of books which deal with all kinds of subjects, which give the author's opinions on all sorts of things, which lead us in all directions of his thoughts, and make us, so to speak, walk around his mind. Macaulay treats philosophy in the English fashion, as a practical man. He is a disciple of Bacon, and sets him above all philosophers; he decides that genuine science dates from him; that the speculations of old thinkers are only witticisms; that for two thousand years the human mind was on a wrong tack; that only since Bacon it has discovered the goal to which it must turn, and the method by which it must arrive there. This goal is utility. The object of knowledge is not theory, but application. The object of mathematicians is not the satisfaction of an idle curiosity, but the invention of machines calculated to alleviate human labor, to increase the power of subduing nature, to render life more secure, commodious, and happy. The object of astronomy is not to furnish matter for vast calculations and poetical cosmogonies, but to subserve geography and to guide navigation. The object of anatomy and the zoological sciences is not to suggest eloquent systems on the nature of organization, or to set before the eyes the orders of the animal kingdom by an ingenious classification, but to conduct the surgeon's hand and the physician's prognosis. The object of every research and every study is to diminish pain, to augment comfort, to ameliorate the condition of man; theoretical laws are serviceable only in their practical use; the labors of the laboratory and the cabinet receive their sanction and value only through the use made of them by workshops and mills; the tree of knowledge must be estimated only by its fruits. If we wish to judge of a philosophy, we must observe its effects; its works are not its books, but its acts. The philosophy of the ancients produced fine writings, sublime phrases, infinite disputes, hollow dreams, systems displaced by systems, and left the world as ignorant, as unhappy, and as wicked as it found it. That of Bacon produced observations, experiments, discoveries, machines, entire arts and industries: