The wide range of the Alps and of their advanced chains thus separated two distinct worlds, in which historical development went on at a different rate. At the same time, the separation between the two slopes of the Alpine system was by no means complete. Nowhere in the Alps do we meet with cold and uninhabited plateaux, as in the Andes and in Tibet, whose enormous extent forms almost insurmountable barriers. The Alpine masses are cut up everywhere into mountains and valleys, and the climate of the latter is sufficiently mild to enable man to exist in them. The mountaineers, who easily maintained their independence, owing to the protection extended to them by nature, first served as intermediaries between the peoples inhabiting the opposite lowlands. It was they who effected the rare exchanges of produce which took place between the North and South, and who opened the first commercial high-roads between the summits of the mountains. The direction of the valleys and the deeply cut mountain passes even then indicated the grand routes by which the Alps would be crossed, at a future period, for the purposes of commerce or of war. That portion of the Alps which lies between the mountain masses of Savoy and of the Mediterranean would naturally cease first to form an obstacle to military expeditions. The Alps there are of great height, it is true, but they are narrower than anywhere else; besides which, the climate on the two opposite slopes is similar, and assimilates the mode of life and the customs of the people dwelling there. Far more formidable, as a natural barrier, are the Alps to the north-east of Mont Blanc, for they constitute a climatic boundary. The other mountain ranges play but a secondary or local part in the history of Europe, when we compare them with the Alps. Still, the influence which they have exercised upon the destiny of nations is no less evident. The table-lands and snow-fields of the Scandinavian Alps form a wall of separation between Norwegians and Swedes. The quadrangular mountain fort of Bohemia, in the centre of Europe, which shelters the Chechians, is almost entirely enclosed by Germans, and resembles an island fretted by the waves of the ocean. The hills of Wales and of Scotland have afforded a shelter to the Celtic race against the encroachments of Anglo-Saxons, Danes, and Normans. The Bretons, in France, are indebted to their rocks and _landes_ for the fact of their not having yet become wholly French; whilst the table-land of Limousin, the hills of Auvergne and the Cevennes constitute the principal cause of the striking contrast which still exists between the inhabitants of Northern and of Southern France. The Pyrenees, next to the Alps, constitute the most formidable obstacle to the march of nations in Europe; they would have remained an insurmountable rampart down to our own time, were it not easy to pass round them by their extremities abutting upon the sea. {13} IV.—THE MARITIME REGIONS.