8. The text has l'art typographique. But Diderot must mean punchcutting and type casting and not typography which he describes below, correctly, as an art on its own. The example of the engraver versus the copperplate printer makes the point, but is unduly dismissive of the poor printer and his pressmen. Though, indeed, the printer does not engrave the plate any more than the framer paints the picture, his skill in printing from it is very far from negligible in the quality of the result - as is painfully apparent when one compares good and bad pulls from the same plate.