The printing-press, in many essential respects, is the most significant invention of all human history. It has touched and vitalized civilizations, countries, nations, languages, and dialects. As an invention it has contributed immeasurably to the currency and the perpetuity of all literature. It also sounded the doom of the written book. Hallam, the Historian of the Middle Ages, says: "Since the invention of printing the absolute extinction of any considerable work seems a danger too improbable for apprehension. The press pours forth in a few days a thousand volumes, which, scattered like seeds in the air over the Republic of Europe, could hardly be destroyed without the extirpation of its inhabitants." And, concerning the exposure to which the manuscript production of all previous history was subjected, he says: "In the times of antiquity manuscripts were copied with cost, labor, and delay; and if the diffusion of knowledge be measured by the multiplication of books (no unfair standard) the most golden ages of ancient learning could never bear the least comparison with the last three centuries. The destruction of a few libraries by accidental fire, the desolation of a few provinces by unsparing and illiterate barbarians, might annihilate every vestige of an author, or leave a few scattered copies, which, from the public indifference there was no inducement to multiply, exposed to similar casualties in succeeding times."[3] In a word, printing has the double advantage over writing of a more rapid multiplication of copies and their increased accuracy. But even with the increased accuracy of printing, few books of considerable size are issued in which errors are not to be found. It is said to be the fact that, after incredible care on the part of editors and professional proofreaders, the offered reward of a guinea for each detected error in the Oxford Revised Version of the Bible brought several errors to light. (International Stand. Bib. Encyclopedia.)