What has happened to the art of printing also occurred to the sister-art of engraving on copper. Tradition had ascribed the invention as the accidental discovery of the goldsmith Maso Finiguerra. But the Germans insist that they possess engravings before the days of the Italian artist; and it is not doubtful that several of the compatriots of Finiguerra were equally practising the art with himself. Heinecken would arbitrate between the jealous patriots; he concedes that Vasari might ascribe the invention of the art in Italy to Finiguerra, yet that engraving might have been practised in Germany, though unknown in Italy. Buonarotti, the great judge of all art, was sensible that in this sort of invention every artist makes his own discoveries. Alluding to the art of engraving, he says, "It would be sufficient to occasion our astonishment, that the ancients did not discover the art of chalcography, were it not known that DISCOVERIES OF THIS SORT generally occur ACCIDENTALLY to the mechanics in the exercise of their calling."[5] On this principle we may confidently rest. All the early printers, like the rivals of Finiguerra at home, and his unknown concurrents in Germany, were proceeding with the same art, and might urge their distinct claims. The natural magic of concave and convex lenses, those miracles of optical science, one of which searches Nature when she eludes the eye, and the other approximates the remotest star--the microscope and the telescope; who were their inventors, and how have those inventions happened? These instruments appeared about the same time. The Germans ascribe the invention of the microscope to a Dutchman, one Drebell; while the Neapolitan Fontana claims the anterior invention; but which Viviani, the scholar of Galileo, asserts, from his own knowledge, was presented to the King of Poland by that father of modern philosophy long anterior to the date fixed on by the Germans. The history of the telescope offers a similar result. Fracastorius may have accidentally combined two lenses; but he neither specified the form nor the quality; and in these consisted the real discovery, which we find in Baptista Porta, and which subsequently was perfected by Galileo. The invention of the art of printing seems a parallel one. It appeared in various quarters about the same time; and in the process of successive attempts, by intimation, by conjecture, and by experiment, each artificer insensibly advanced into a more perfect invention; till some fortunate claimant for the discovery puts aside all preceding essayists, who, not without some claims to the invention, leave their advocates in another generation to dispute about their rights, which are buried in oblivion, or falsified by traditional legends.