It is a singular coincidence that the discovery of printing and that of the art of taking proofs on paper from a plate engraved in intaglio, or, to speak more exactly, that the final improvements of both these processes, should have sprung up almost simultaneously, one in Italy and the other in Germany. There is only an interval of two years between the time when Finiguerra printed his first engraving in 1452, and the time when Gutenberg exhibited his first attempts at printing in 1454. Till then, copies drawn, painted, or written by hand had been the only efficient means of reproduction. None, even amongst those most capable of original thought or action, considered it beneath them to set forth the thought of others. Boccaccio and Petrarch exchanged whole books of Livy or of Cicero which they had patiently transcribed, and monkish or professional artists copied on the vellum of missals the paintings which covered the walls or adorned the altars of their churches. Such subjects as were engraved on wood were only designed to stimulate the devotion of the pious. Both by their inadequate execution, and the special use for which they were intended, they must rank as industrial products rather than as works of art. Besides illumination and wood engraving, there was a process sometimes used to copy certain originals, portraits or fancy subjects, but more frequently employed by goldsmiths in the decoration of chalices, reliquaries, and altar canons. This process was nothing but a special application and combination of the resources belonging to the long known arts of enamelling and chalcography, which last simply means engraving on metal. The incised lines made by the graver in a plate of silver, or of silver and gold combined, were filled with a mixture of lead, silver, and copper, made more easily fusible by the addition of a certain quantity of borax and sulphur. This blackish-coloured mixture (_nigellum_, whence _niello_, _niellare_) left the unengraved parts exposed, and, in cooling, became encrusted in the furrows where it had been introduced. After this, the plate, when carefully polished, presented to the eye the contrast of a design in dull black enamel traced upon a field of shining metal. Towards the middle of the fifteenth century this kind of engraving was much practised in Italy, especially in Florence, where the best niellatori were to be found. One of them, Tomaso, or for short, Maso Finiguerra, was, like many goldsmiths of his time, at once an engraver, a designer, and a sculptor. The drawings attributed to him, his nielli, and the bas-reliefs partly by him and partly by Antonio Pollajuolo, would not, perhaps, have been enough to have preserved his memory: it is his invention--in the degree we mentioned--of the art of printing intaglio engravings, or rather of the art of engraving itself, that has made him immortal.