Great _discoveries and inventions_ had been made. The use of movable types, first ascribed to a German, of Mentz, by the name of Gutenberg, in 1441, and to Peter Schoeffer, in 1444, changed the whole system of book-making, and vastly increased the circulation of the Scriptures, the Greek and Latin classics, and all other valuable works, which, by the industry of the monkish copyist, had been preserved from the ravages of time and barbarism. Gunpowder, whose explosive power had been perceived by Roger Bacon as early as 1280, though it was not used on the field of battle until 1346, had completely changed the art of war and had greatly contributed to undermine the feudal system. The polarity of the magnet, also discovered in the middle ages, and not practically applied to the mariner's compass until 1403, had led to the greatest event of the fifteenth century--the discovery of America by Christopher Columbus, in 1492. The impulse given to commerce by this and other discoveries of unknown continents and oceans, by the Portuguese, the Spaniards, the Dutch, the English, and the French, cannot be here enlarged on. America revealed to the astonished European her riches in gold and silver; and Indian spices, and silks, and drugs, were imported, through new channels, into all the countries inhabited by the Teutonic races. Mercantile wealth, with all its refinements, acquired new importance in the eyes of the nations. The world opened towards the east and the west. The horizon of knowledge extended. Popular delusions were dispelled. Liberality of mind was acquired. The material prosperity of the western nations was increased. Tastes became more refined, and social intercourse more cheerful. [Sidenote: Revival of the Arts.] Art, in all its departments, was every where revived at this epoch. Houses became more comfortable, and churches more splendid. The utensils of husbandry and of cookery were improved. Linen and woollen manufactures supplanted the coarser fabrics of the dark ages. Music became more elaborate, and the present system of notation was adopted. The genius of the sculptor again gave life and beauty to a marble block, and painting was carried to greater perfection than by the ancient Greeks and Romans. Florence, Venice, Milan, and Rome became seats of various schools of this beautiful art, of which Michael Angelo, Correggio, the Carracci, and Raphael were the most celebrated masters, all of whom were distinguished for peculiar excellences, never since surpassed, or even equalled. The Flemish artists were scarcely behind the Italian; and Rubens, of Antwerp, may well rank with Correggio and Titian. To Raphael, however, the world has, as yet, furnished no parallel. [Sidenote: Influence of Feudalism.]