Page:De Vinne, Invention of Printing (1876).djvu/98

 V

hypothesis, for it is nothing more, that all the early prints were produced by the frotton does not satisfactorily explain the large production of merchantable printed matter during the first half of the fifteenth century. Friction would have served then, as it does now, for trial proofs or experiments, but it was a method altogether too slow and uncertain to meet the requirements of an extended business. The playing cards and prints so common during this period must have been made by a quicker method. That there was an established international trade in playing cards and in other kinds of printed work, as early as the year 1441, may be inferred from the following decree of the senate of Venice: