“ In the arts, anything which is the result of, or which takes its principal characteristic from, having been printed upon or impressed. The most important use of the term, especially in connection with fine arts, is as being the only proper term for that picture which is produced by taking an impression, as upon paper, from an engraved plate or block. ”

“ The art of printing from an engraved plate is not wholly mechanical, because there are many cases in which the impression taken is not merely a flat transfer from the unmodified, hard surface. Thus, in printing woodcuts, it is customary to use what are called overlays, which are pieces of thin paper cut in peculiar shapes, accommodated to the design engraved upon the block ”