The last and most complete state of engraving upon copper, comes next under our notice. For this improvement, it appears to me, we are as much indebted to Germany as for the art of printing books. The press there first discovered for typography, opened the way for that applied to copper plates. The mechanical construction to be sure was different, in the former the impression being drawn from cast letters which rise outwards; in the latter from plates cut hollow within by the artist's graver. A kind of ink was at the same time adopted, of a stronger and less fuliginous colour, than had been used for engravings in wood; but as it is termed by Meerman (p. 12), "singulare ac tenuius." The same author fixes the date of this improvement in the art at about 1470; and most probably he meant to deduce it from the earliest copper engravings which appeared in Germany. Of this I cannot venture to speak, not having seen the two specimens cited by Heineken, and the others that bear a date; nor is it at all connected with our present history of Italian art, as far as regards engraving. We gather from it, that such improvement was brought to us from Germany by the same Corrado Sweyneym, who prepared the beautiful edition of Ptolemy at Rome. We learn from the anonymous preface prefixed, that Corrado devoted three years to the task, and left it incomplete; and it was continued by Arnold Buckinck, and published by him, as I already observed, in 1478. The tables are engraved with a surprising degree of elegance, and are taken from the press, as Meerman, adopting the opinion of Raidelio, and of such bibliographers as have described it, has clearly shewn, (p. 258). It is conjectured that Corrado commenced his labours about 1472, a fact ascertained no less from the testimony of Calderino, the corrector of the work, than from the tables, impressions of which were taken in 1475.[126] Some are of opinion that the engraving was from the hand of Corrado, although the author of the preface simply observes, "animum ad hanc doctrinam capessendam applicuit (that is, to geography) subinde matematicis adhibitis viris quemadmodum tabulis æneis imprimerentur edocuit,[127] triennioque in hâc curâ consumpto diem obiit." And it seems very probable, that as he employed Italians in the correction of the text, he was also assisted by some one of the same nation in the engravings. It strikes me, likewise, that Botticelli was attracted by this novel art at Rome, since on his return about the year 1474, he began to engrave copper plates with all the ardour that Vasari has described, and was in fact the first who represented full figures and histories in the new art. Perhaps the cause of his impressions being less perfect than others, arose from his ignorance of the method of printing upon a single page, both the plates and the characters; as well as from the want of the press, and that improved plan derived from the office of the German printers. But from whatever cause, it is certain,