In further illustration of this, take the Ural chain, which was and still is the eastern division line of one continent, and the western barrier of another, but which has become, since the days of Peter the Great, a grand center of labor and commerce, a great avenue of civilization in its return passage from Europe to Asia. And so everywhere, from the wild Caucasus and the Himalayas to the grand Cordilleras of America, the same progress is seen; man becomes more and more the conqueror over nature. And not in mountains alone, but in the great forest regions of central Europe, in the primitive wilderness of North America, and in the marshes of the Netherlands, does man vanquish the forces which once fettered him. The once fearful wastes of Sahara have become the track of caravans; the sterile plains of Australia and California have drawn great colonies to their gold mines; the ice seas at the north have become, through the efforts of Parry, Franklin, and others, the scene of heroic exploits and of grand struggles of man with nature; indeed, the greatest victories of modern civilization have been there, and the playgrounds of polar bears and walruses have witnessed the noblest humanities, and the loftiest courage, and the most disinterested heroism of the age. The continents and oceans have witnessed still greater transformations. The seas were once the impassable barriers of nations. The birds of the air only traversed the great distances which separated shore from shore. The metallic stores of the earth, the vegetable and animal kingdoms were not transferred to any extent from place to place; the sea brought nothing from lands remotely foreign but drift-sand, cocoa-nuts, floating wood, ice masses, and seaweed, swept by the great currents from shore to shore. But now the seas are no barriers; they do not separate the continents but bind them together, and unite the destinies of nations in the closest manner. The great improvements in ocean navigation have entirely changed the relations of the entire globe. The isolated island of St. Helena, which was for centuries at the very confines of the known world, became, within the second decade of the present century, a prison-house for the great European robber, and lay guarded under the eye of Europe. The Cape of Good Hope, which was for centuries the limit of Portuguese navigation, has become a mere halting-place for sailing ships and steamers. The voyage from England to China has been narrowed, within one hundred years, from an eight months’ to a four months’ sail. These great changes have been mainly effected by the agency of steam. Steam has transformed the smaller seas into mere bridges, and England and France are securely joined, Marseilles and Algiers; while Prussian Stettin is brought into proximity with Swedish Stockholm and Russian Petersburg. The voyage to America, that remote land, which before the days of Columbus was as inaccessible as the moon, was made by him in