It was the lucky hit of the philosopher rather than the poet.] Then followed the Middle Ages; the dark ages, as they are called, though in their darkness were matured those seeds of knowledge, which, in fulness of time, were to spring up into new and more glorious forms of civilization. The organization of society became more favorable to geographical science. Instead of one overgrown, lethargic empire, oppressing every thing by its colossal weight, Europe was broken up into various independent communities, many of which, adopting liberal forms of government, felt all the impulses natural to freemen; and the petty republics on the Mediterranean and the Baltic sent forth their swarms of seamen in a profitable commerce, that knit together the different countries scattered along the great European waters. But the improvements which took place in the art of navigation, the more accurate measurement of time, and, above all, the discovery of the polarity of the magnet, greatly advanced the cause of geographical knowledge. Instead of creeping timidly along the coast, or limiting his expeditions to the narrow basins of inland waters, the voyager might now spread his sails boldly on the deep, secure of a guide to direct his bark unerringly across the illimitable waste. The consciousness of this powered thought to travel in a new direction; and the mariner began to look with earnestness for another path to the Indian Spice-islands than that by which the Eastern caravans had traversed the continent of Asia. The nations on whom the spirit of enterprise, at this crisis, naturally descended, were Spain and Portugal, placed, as they were, on the outposts of the European continent, commanding the great theatre of future discovery. Both countries felt the responsibility of their new position. The crown of Portugal was constant in its efforts, through the fifteenth century, to find a passage round the southern point of Africa into the Indian Ocean; though so timid was the navigation, that every fresh headland became a formidable barrier; and it was not till the latter part of the century that the adventurous Diaz passed quite round the Stormy Cape, as he termed it, but which John the Second, with happier augury, called the Cape of Good Hope. But, before Vasco de Gama had availed himself of this discovery to spread his sails in the Indian seas, Spain entered on her glorious career, and sent Columbus across the western waters.