Since that epoch the limits between Europe and Asia have been shifted by geographers still further to the east. They are, however, more or less conventional, for Europe, though bounded on three sides by the ocean, is in reality but a peninsula of Asia. At the same time, the contrasts between these two parts of the world fully justify scientific men in dividing them into two continental masses. But where is the true line of separation between them? Map-makers generally adopt the political boundaries which it has pleased the Russian Government to draw between its vast European and Asiatic territories, and others adopt the summits of the Ural Mountains and of the Caucasus as the boundary between the two continents; and although, at the first glance, this delineation appears more reasonable than the former, it is in reality no less absurd. The two slopes of a mountain chain can never be assigned to different formations, and they are generally inhabited by men of the same race. The true line of separation between Europe and Asia does not consist of mountains at all, but, on the contrary, of a series of depressions, in former times covered by a channel of the sea which united the Me­di­ter­ra­nean with the Arctic Ocean. The steppes of the Manych, between the Black Sea and the Caspian, and to the north of the Caucasus, are still covered in part with salt swamps. The Caspian itself, as well as Lake Aral and the other lakes which we meet with in the direction of the Gulf of Obi, are the remains of this ancient arm of the sea, and the intermediate regions still bear the traces of having been an ancient sea-bed.

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Fig. 2.—THE RELIEF OF EUROPE.

According to Houzeau, Berghaus, Kiepert, Olsen, and others.
Scale 1 : 60,000,000.

There can be no doubt that vast changes have taken place in the configuration {9} of Europe, not only during more ancient geological periods, but also within comparatively recent times. We have already seen that a vast arm of the sea formerly separated Europe from Asia; it is equally certain that there was a time when it was joined to Anatolia by an isthmus, which has since been converted into the Bosphorus of Constantinople; Spain was joined to Africa until the waters of the Atlantic invaded the Me­di­ter­ra­nean; Sicily was probably connected with Mauritania; and the British Islands once formed a portion of the mainland. The erosion of the sea, as well as upheavals and subsidences of land, has effected, and still effect, changes in the contours of our coasts. Numerous soundings in the seas washing Western Europe have revealed the existence of a submarine plateau, which, from a geological point of view, must be looked upon as forming an integral portion of our continent. Bounded by abyssal depths of thousands of fathoms, and submerged one hundred fathoms at most below the waters of the ocean, this pedestal of France and the British Islands must be looked upon as the foundation of an ancient continent, destroyed by the incessant action of the waves. If the shallow portions of the ocean, as well as those of the Me­di­ter­ra­nean Sea, were to be added to Europe, its area would be increased to the extent of one-fourth, but it would lose, at the same time, that wealth in peninsulas which has secured to Europe its historical superiority over the other continents.

If we supposed Europe to subside to the extent of one hundred fathoms, its area would be reduced to the compass of one-half. The ocean would again cover her low plains, most of which are ancient sea-beds, and there would remain above the waters merely a skeleton of plateaux and mountain ranges, far more extensively indented by bays and fringed by peninsulas than are the coasts existing at the present time. The whole of Western and Southern Europe would be converted into a huge island, separated by a wide arm of the sea from the plains of interior Russia. From an historical as well as a geological point of view, this huge island is the true Europe. Russia is not only half Asiatic on account of its extremes of temperature, and the aspect of its monotonous plains and interminable steppes, but is likewise intimately linked with Asia as regards its inhabitants and its historical development. Russia can hardly be said to have belonged to Europe for more than a hundred years. It was in maritime and mountainous Europe, with its islands, peninsulas, and valleys, its varied features and unexpected contrasts, that modern civilisation arose, the result of innumerable local civilisations, happily united into a single current. And, as the rivers descending from the mountains cover the plains at their foot with fertile soil, so has the progress accomplished in this centre of enlightenment gradually spread over the other continents to the very extremities of the earth.

III.—NATURAL DIVISIONS AND MOUNTAINS.

The Europe alluded to includes France, Germany, England, and the three Me­di­ter­ra­nean peninsulas, and constitutes several natural divisions. The British Islands form one of these. The Iberian peninsula is separated scarcely less {10} distinctly from the remainder of Europe, for between it and France rises a most formidable range of mountains, the most difficult to cross in all Europe; and immediately to the north of it a depression, nowhere exceeding a height of 650 feet, extends from the Me­di­ter­ra­nean to the Atlantic Ocean. The geographical unity of Europe is represented to the full extent only in the system of the Alps, and in the mountains of France, Germany, Italy, and the Balkan peninsula which are connected with it. It is there we must seek the framework of continental Europe.

The Alps, whose ancient Celtic name probably refers to the whiteness of their snowy summits, stretch in an immense curve, more than 600 miles in length, from the shores of the Me­di­ter­ra­nean to the plains of the Danube. They consist in reality of more than thirty mountain masses, representing as many geological groups, and joined to each other by elevated passes; but their rocks, whether they be granite, slate, sandstone, or limestone, form one continuous rampart rising above the plains. In former ages the Alps were higher than they are now. This is proved by an examination of their detritus and of the strata disintegrated by natural agencies. But, whatever the extent of detrition, they still rise in hundreds of summits beyond the line of perennial snow, and vast rivers of ice descend from them into every upland valley. Looked at from the plains of Piedmont and Lombardy, these glaciers and snow-fields present the appearance of sparkling diadems encircling the mountain summits.