He who sails from Europe to cross the Atlantic, having been fortunate enough to get clear of our ports in which he too frequently is imprisoned by the westerly wind, and having cleared the variable zone of our capricious seas, speedily gets into the fine climate and constant serenity which the N. E. breezes, the genial trade-winds, spread over sea and sky. Above and around, everything favors him, everything smiles upon him, but, as he approaches the Line, the inspiring breezes cease to breathe balmily upon him, and the air is almost suffocating. He enters the circle of those calms which prevail under the Equator, and present unchangeably their barrier between our northern trade-winds and those of the south. Heavy mists and clouds are all above and around him, and the tropical rains descend in mighty torrents. Bitterly the seaman complains of those gloomy and deluging clouds, but only for their gloomy screen what scathing beams would descend upon the poor dizzy heads, and be reflected in smiting power from the bright, broad mirror of the Atlantic? _But_ for those torrents which fall upon the other face of our globe, the Indian Ocean and the sea of Coral, what would be their fermentation in the craters of their antique volcanoes! That dark mass of blackest clouds, once the terror of the navigator and the obstacle to navigation, that sudden and dense night extended over those broad waters form precisely the safeguard, the protecting facility which softens our passage and enables us, sailing southward still, to meet again the bright sun, the clear sky, and the balmy mildness of the regular winds. Quite naturally, quite inevitably, the heats of the Line raise the waters in masses of vapor, and form that dark band, so threatening in appearance, but in reality so beneficent. The observer who from some other planet could look upon our world would see around her a ring of clouds not unlike the belt of Saturn. Did he seek the purpose and the use of that ring, he might, in reply, be told--"It is the regulator which, by turns absorbing and giving forth, equalizes the evaporation and fall of the waters, distributes the rains and dews, modifies the heat of each country, interchanges the vapors of the two worlds, and borrows from the southern world the rivers and streams of our northern world." Marvellous co-partnership and mutual reaction! South America, from the respiration of its vast forests, condensed into clouds, fraternally nourishes the flowers and fruits of our Europe. The air which revives and inspirits us, is the tribute paid by the hundred isles of Asia, exhaled by the great vegetation of Java or Ceylon, and entrusted to the great cloud-messenger that turns with the world and sheds life and freshness upon it.