The material used for the earliest known writings was made from bamboo fibre, and was prepared in the shape of tablets. Early in the third century B.C. (curiously enough, during the reign of Hwang-ti, the destroyer of literature), brushes were invented, with which characters could be traced upon silk. The bamboo was either scratched upon with a sharp stylus, or the characters were painted upon it with a dark varnish. Sometimes also the characters were burned into the bamboo, with a heated metal stylus. India ink was first used in the seventh century. The invention of paper took place about 100 B.C., the first material utilized for the manufacture being bark, fishing-nets, and rags. Printing from solid blocks was done as early as the first century A.D. The invention of the art of printing from movable type is credited to a blacksmith named Pi-Shing. The blacksmith’s first books were turned out towards the close of the tenth century A.D., or early in the eleventh century, more than three centuries before the presses of Gutenberg began their work in Mayence. The movable type used by Pi-Shing were made of plastic clay. At the same time, or shortly thereafter, porcelain type were utilized. The printing from movable type never seems to have developed to such extent as to supersede block printing. The Emperor Kang-He had engraved about two hundred and fifty thousand copper type, which were used for printing the publications of the government. These type were afterwards melted for use as _cash_, but were replaced by his grandson with type made from lead.[7] There is record of books being printed in Corea (at that time a province of the Empire) from movable clay type, as early as 1317 A.D.[8] Literature has always been an honored profession in China, and seems even in the earliest times to have attracted a larger proportion of workers than, during the same period, were engaged in literary pursuits in any other countries in the world. The mass of literature was very much added to after the introduction of Buddhism into the country, which took place during the first century of the Christian era. Karpeles states that a selection of the early Chinese classics, with commentaries, undertaken under the direction of one of the emperors in the eighteenth century, would, it was calculated, comprise when completed, 163,000 volumes. By the year 1818, there had been published of the series, 78,731 volumes.[9] From this enormous mass of material a few books only stand out as possessing distinctive importance by reason of their influence on the thought and the life of many generations.