Of the early condition of Europe, since we have to consider it in its prehistoric times, our information must necessarily be imperfect. Perhaps, however, we may be disposed to accept that imperfection as a sufficient token of its true nature. Since history can offer us no aid, our guiding lights must be comparative theology and comparative philology. Proceeding from those times, we shall, in detail, examine the intellectual or philosophical movement first exhibited in Greece, endeavouring to ascertain its character at successive epochs, and thereby to judge of its complete nature. Fortunately for our purpose, the information is here sufficient, both in amount and distinctness. It then remains to show that the mental movement of the whole continent is essentially of the same kind, though, as must necessarily be the case, it is spread over far longer periods of time. Our conclusions will constantly be found to gather incidental support and distinctness from illustrations presented by the aged populations of Asia, and the aborigines of Africa and America. [Sidenote: The five ages of European life.] The intellectual progress of Europe being of a nature answering to that observed in the case of Greece, and this, in its turn, being like that of an individual, we may conveniently separate it into arbitrary periods, sufficiently distinct from one another, though imperceptibly merging into each other. To these successive periods I shall give the titles of--1, the Age of Credulity; 2, the Age of Inquiry; 3, the Age of Faith; 4, the Age of Reason; 5, the Age of Decrepitude; and shall use these designations in the division of my subject in its several chapters. * * * * * [Sidenote: The world is ruled by law.] From the possibility of thus regarding the progress of a continent in definite and successive stages, answering respectively to the periods of individual life--infancy, childhood, youth, maturity, old age--we may gather an instructive lesson. It is the same that we have learned from inquiries respecting the origin, maintenance, distribution, and extinction of animals and plants, their balancing against each other; from the variations of aspect and form of an individual man as determined by climate; from his social state, whether in repose or motion; from the secular variations of his opinions, and the gradual dominion of reason over society: this lesson is, that the government of the world is accomplished by immutable law.