As we have already said, the charm of the woodcut pictures in incunabula lies in their simplicity, in their rude story-telling power, often very forcible and direct, in the valiant effort, sometimes curiously successful in cuts otherwise contemptibly poor, to give character and expression to the human face, and as regards form in the harmony between the woodcuts and the paper and type of the books in which they appear. In the book-illustrations of the sixteenth century the artist is more learned, more self-conscious, and his design is interpreted with far greater skill by the better trained wood-cutters of his day. More pains are taken with accessories, and often perhaps for this reason the cut does not tell its story so quickly as of old. It is now a work of art which demands study, no longer a signpost explaining itself however rapidly the leaf is turned. Lastly, the artist seems seldom to have thought of the form of the book in which his work was to appear, of the type with which the text was to be printed, or even of how the wood-cutter was to interpret his design. Book-illustration, which had offered to the humble makers of playing-cards and pictures of saints new scope for their skill, became to the artists of the sixteenth century a lightly valued method of earning a little money from the booksellers, their better work being reserved for single designs, or in some cases for the copperplates which at first they executed, as well as drew, themselves. Thus the book-collector is conscious, on the one hand, that less pains have been taken to please him, and on the other that he is separating by his hobby one section of an artist's work from the rest, in connection with which it ought to be studied. He may even be in some doubt as to where his province ends, since many of the illustrated books of the sixteenth century, although they possess a titlepage and are made up in quires, are essentially not books at all, the letterpress being confined to explanations of the woodcuts printed either below them or facing them on the opposite pages. The bibliographer himself, it may be added, feels somewhat of an intruder in this field, which properly belongs to the student of art, although in so far as art is enshrined in books and thus brought within the province of the book-collector, bibliography cannot refuse to deal with it.