In the Haarlem Town Library there is a pedigree of the Coster family. In its present form it dates from 1559, but the earlier part was evidently copied from an old document. This pedigree says that Lourens Janssoen Coster invented printing in 1446. While we have not here an exact agreement of dates we have one near enough for all practical purposes. The Costeriana run back for a period which may be conservatively stated at thirty years from 1474, that is to say, to 1444 or thereabouts. Zell says that printed Donatuses came from Holland, but that the art of printing as practiced in 1499 was invented at Mainz, and this invention, as we shall presently show, is fixed as subsequently to 1450. Junius, writing in 1568, says that Coster discovered printing 128 years previously, that is to say, 1440. If we now turn to the examination of the evidence in support of the claim for Gutenberg, we find that it is lacking in material of the first or even of the second class. It is not absolutely certain that we have any book printed by Gutenberg. If, however, for the sake of the argument we admit that he printed nearly or quite all of the works that are attributed to him we find that they are all much better in workmanship and appearance than the Haarlem books. None of them are printed on one side of the page only, excepting, of course, small matters which would not cover more than one page, and there are no signs whatever of transition from any previous type of printing to typography. Those who have accepted the theory of Gutenberg’s invention have marveled at the perfection of his work, as well they might.