When Adolphus of Nassau captured Mayence in 1462, the workmen skilled in the art, which had been kept a secret, were scattered through the world; and by the end of the fifteenth century the principal nations of Europe, and especially Italy, France, and England, had become rivals of Germany in prosecuting it. Books had previously been transcribed, chiefly by monks, upon expensive parchment, and often beautifully ornamented with elaborate drawings and paintings. They had therefore been an article of luxury, and confined to the rich. But a book printed on paper was easily made accessible to all classes, for copies were so numerous that each could be sold at a low price. Beside books of devotion, the writings of the Greek and Latin poets, historians and philosophers, most of which had fallen into oblivion during the Middle Ages, now gradually obtained wide circulation. After the fall of Constantinople, and the subjugation of Greece by the Turks, fugitive Greeks brought the works of their forefathers’ genius to Italy, where enlightened men had already begun to study them. This branch of learning, called “the Humanities,” spread from Italy through Germany, France, England, and other countries, and contributed powerfully to produce a finer taste and more intelligent habits of thought, such as put to shame the rude ignorance of the monks. It was the art of printing that broke down the slavery in which the blind faith of the church held the human mind; and even the censorship which Rome set up to oppose it was not able to undo its work. Just as the convents fell before the art of printing, so did the castles of the robber knights before the invention of gunpowder. Thus, at the coming of the Reformation, these degenerate remnants of the once noble institutions of knighthood were swept away. It is supposed by many that the knowledge of gunpowder was brought into Europe from China during the great Mongolian emigration of the thirteenth century, the Chinese having long possessed it. The Arabs, too, understood how to make explosive powder, by mixing saltpeter, charcoal, and sulphur. But all the Eastern makers produced only the fine powder, and the art of making it in grains seems to have been the device of Berthold Schwarz, a German monk of the Franciscan order, of Freiburg or Mayence, in 1354; and he is commonly called the inventor of gunpowder. He had a laboratory, in which he devoted himself to alchemy; and is said to have made his discovery by accident. But as early as 1346, a chronicle reports that there was at Aix “an iron barrel to shoot thunder;” and in 1356 the armory at Nuremberg contained guns of iron and copper, which threw missiles of stone and lead. One of the earliest instances in which cannon are known to have been effectively used in a great battle was at Agincourt in 1415. But gunpowder was long regarded with abhorrence by the people, and made its way into general use but slowly.[B] MARTIN LUTHER.