In the twelfth and thirteenth centuries--the height of the middle ages --came a wonderful outburst of intellectual and artistic activity. Under the immediate auspices of the Catholic Church it brought forth abundantly a peculiarly Christian culture. Renewed acquaintance with Greek philosophy, especially with that of Aristotle, was joined with a lively religious faith to produce the so called scholastic philosophy and theology. Great institutions of higher learning--the universities-- were now founded, in which centered the revived study not only of philosophy but of law and medicine as well, and over which appeared the first cloud-wrapped dawn of modern experimental science. And side by side with the sonorous Latin tongue, which long continued to be used by scholars, were formed the vernacular languages--German, English, French, Italian, Spanish, Portuguese, etc.--that gave a wealth of variety to reviving popular literature. Majestic cathedrals with pointed arch and flying buttress, with lofty spire and delicate tracery, wonderful wood carvings, illuminated manuscripts, quaint gargoyles, myriad statues of saints and martyrs, delicately colored paintings of surpassing beauty--all betokened the great Christian, or Gothic, art of the middle ages. [Sidenote: New Elements in Culture of Sixteenth Century] The educated person of the sixteenth century was heir to all these cultural periods: intellectually and artistically he was descended from Greeks, Romans, Mohammedans, and his medieval Christian forbears. But the sixteenth century itself added cultural contributions to the original store, which help to explain not only the social, political, and ecclesiastical activities of that time but also many of our present-day actions and ideas. The essentially new factors in sixteenth-century culture may be reckoned as (1) the diffusion of knowledge as a result of the invention of printing; (2) the development of literary criticism by means of humanism; (3) a golden age of painting and architecture; (4) the flowering of national literature; (5) the beginnings of modern natural science. THE INVENTION OF PRINTING