_Decline of Greek Theology, occasioned by the Advance of Geography and Philosophical Criticism.--Secession of Poets, Philosophers, Historians.--Abortive public Attempts to sustain it.--Duration of its Decline.--Its Fall._ Europe is geographically a peninsula, and historically a dependency of Asia. [Sidenote: Description of Europe.] [Sidenote: The great path-zone.] It is constructed on the western third of a vast mountain axis, which reaches in a broken and irregular course from the Sea of Japan to the Bay of Biscay. On the flanks of this range, peninsular slopes are directed toward the south, and extensive plateaus to the north. The culminating point in Europe is Mont Blanc, 16,000 feet above the level of the sea. The axis of elevation is not the axis of figure; the incline to the south is much shorter and steeper than that to the north. The boundless plains of Asia are prolonged through Germany and Holland. An army may pass from the Pacific to the Atlantic Ocean, a distance of more than six thousand miles, without encountering any elevation of more than a few hundred feet. The descent from Asia into Europe is indicated in a general manner by the mean elevation of the two continents above the level of the sea; that for Asia being 1132 feet, that for Europe 671. Through the avenue thus open to them, the Oriental hordes have again and again precipitated themselves on the West. With an abundance of springs and head-waters, but without any stream capable of offering a serious obstacle, this tract has a temperature well suited to military movements. It coincides generally with the annual isothermal line of 50°, skirting the northern boundary beyond which the vine ceases to grow, and the limiting region beyond which the wild boar does not pass. [Sidenote: Exterior and interior accessibility.] Constructed thus, Europe is not only easily accessible from Asia, a fact of no little moment in its ancient history, but it is also singularly accessible interiorly, or from one of its parts to another. Still more, its sea-line is so broken, it has so many intrusive gulfs and bays, that, its surface considered, its maritime coast is greater than that of any other continent. In this respect it contrasts strikingly with Africa. Europe has one mile of coast-line for every 156 square miles of surface, Africa has only one for every 623. This extensive maritime contact adds, of course, greatly to its interior as well as exterior accessibility. [Sidenote: Distribution of heat in Europe.]