The celebrated Italian metal-worker, Maso Finiguerra, worked extensively in niello, and to him is ascribed the discovery of the art of engraving on copper and printing from the copper plate. He was a goldsmith and a native of Florence, and was the pupil of Ghiberti and Masaccio. In the year 1452 he made a pax, on the flat panel of which he engraved a design to be filled in afterwards with the black composition of niello, but before he had completely finished his work he took a “squeeze” in clay of the engraving in order to judge of the progress he had made, and from this squeeze he made a mould in sulphur, and filled it with a black pigment, and on pressing this sulphur block on a sheet of damp paper the pattern appeared similar to the niello effect. This led him to fill the lines of the actual silver plate with a more durable ink, and to print off impressions on paper. It was by thus experimenting that Finiguerra discovered the art of engraving and printing from the metal plate. The original pax with its impressions are preserved at Florence. Damascening is executed in three ways. First, where the steel or copper is engraved with an undercut line and a thread of gold or silver is forced in by hammering or pressed by a burnisher into the grooved lines. Second, the plated method, where the plate of metal to be encrusted is enclosed between slightly raised walls in the foundation metal. Third, where the foundation metal is roughened by a sharp tool in all directions and the gold or silver is laid on thinly and pressed or hammered in. The last method is the latest and least durable. Sometimes the lines of the engraving are punched with holes at regulated distances, which serve as keys to hold the inlaid metal when hammered in. [Illustration: Fig. 192.—Shield Damascened in Gold; Indian. (B.)] The famous bowl called the “Baptistery of St. Louis,” now in the Louvre, is made of copper inlaid with figures of horsemen and hunting scenes. It is an example of “Mosil work,” or Mesopotamian damascening, of the thirteenth century, in which silver only is used as the inlaid metal. A delicate design in Italian damascene work is shown at Fig. 191, and an Indian example at Fig. 192. The Italian example shows the Arabian influence in some of the details of the ornament. The Japanese are perfect masters in the art of damascening. Sword-blades of the thirteenth and later centuries have beautiful designs inlaid as intaglios or in damascene work; sword-guards of the seventeenth and eighteenth centuries are remarkable for this kind of decoration, and for the exquisite chasing of the iron, which in some cases is cut out like fret-work, and in others are carved as delicate as decorative ivory work. INDIAN JEWELLERY.