Block-books possess two permanent attractions in addition to their supposed historical importance in the development of the invention of printing on which doubt is now cast--the attraction of popular literature and the attraction of the illustrated book. As we have seen, it would not have been worth any one's while to cause a block-book to be laboriously engraved, or cut, unless a large and speedy sale could be expected for it. The most famous block-books are nearly all of a religious character, and they prove a widespread desire for simple instruction as to the incidents of the life of Christ and the events in the Old Testament history which were regarded as prefigurements of them, as to the dignity of the Blessed Virgin and the doctrine of the Virgin Birth, as to the end of the world and the coming of Antichrist, and as to the spiritual dangers and temptations of the dying and the means by which they might be resisted. As early specimens of book-illustration the value of the block-books varies very greatly. The majority of them are more curious than beautiful, but the pictures of the _Cantica Canticorum_, the _Speculum Humanae Saluationis_, and the _Ars Moriendi_ have all very great merit. The tall, slender figures in the Song of Songs have a charm as great as any Dutch book-illustrations of the fifteenth century; the cuts of the _Speculum_ are full of vigour, while the serene dignity of the scenes in the _Ars Moriendi_ illustrating the Inspirations of the Good Angel is as impressive as the grotesque force used in depicting the diabolic suggestions. If we must grant, as the weight of authority now bids us, that these woodcuts are copies from the copper engravings of the Master E. S., it can hardly be disputed that the wood-cutter was the better artist of the two.