[Sidenote: Invention of printing: its early history.] About A.D. 1440 the art of printing seems to have been invented in Europe. It is not material to our purpose to inquire into the particulars of its history, whether we should attribute it to Coster of Haarlaem or Gutenberg of Mentz, or whether, in reality, it was introduced by the Venetians from China, where it had been practised for nearly two thousand years. In Venice a decree was issued in 1441 in relation to printing, which would seem to imply that it had been known there for some years. Coster is supposed to have printed the "Speculum Humanæ Salvationis" about 1440, and Gutenberg and Faust the Mentz Bible without date, 1455. The art reached perfection at once; their Bible is still admired for its beautiful typography. Among the earliest specimens of printing extant is an exhortation to take up arms against the Turks, 1454; there are also two letters of indulgence of Nicolas V. of the same date. In the beginning each page was engraved on a block of wood, but soon movable types were introduced. Impressions of the former kind pass under the name of block books; at first they were sold as manuscripts. Two of Faust's workmen commenced printing in Italy, but not until 1465; they there published an edition of "Lactantius," one of "Cicero de Officiis," and one of "Augustine de Civitate Dei." The art was carried to France 1469, and in a few years was generally practised in all the large European towns. [Sidenote: Early books and booksellers.] The printers were their own booksellers; the number of copies in each edition usually about three hundred. Folios were succeeded by quartos, and in 1501 duodecimos were introduced. Very soon the price of books was reduced by four fifths, and existing interests required regulations not only respecting the cost, but also respecting the contents. Thus the University of Paris established a tariff for their sale, and also exercised a supervision in behalf of the Church, and the State. From the outset it was clear that printing would inevitably influence the intellectual movement synchronously occurring.