But the new invention was not universally acclaimed. Trithemius with his conservative mind quickly detected some weaknesses; and in 1492 he composed a treatise 'In praise of scribes', in vain attempt to arrest the flowing tide. 'Let no one say, "Why should I trouble to write books, when they are appearing continually in such numbers? for a moderate sum one can acquire a large library." What a difference between the results achieved! A manuscript written on parchment will last a thousand years: books printed on paper will scarcely live two hundred. Besides, there will always be something to copy: not everything can be printed. Even if it could, a true scribe ought not to give up. His pen can perpetuate good works which otherwise would soon perish. He must not be amazed by the present abundance that he sees, but should look forward to the needs of the future. Though we had thousands of volumes, we must not cease writing; for printed books are never so good. Indeed they usually pay little heed to ornament and orthography.' It is noticeable that only in this last point does Trithemius claim for manuscripts superior accuracy. In the matter of permanence we may wonder what he would have thought of modern paper. The first advance, then, rendered possible by the invention of printing was to more uniform and better texts: the next step forward was no less important. To scholars content with the general sense of a work, a translation might be as acceptable as the original. Improved standards of accuracy led men to perceive that an author must be studied in his own tongue: in order that no shade of meaning might be lost. Here again the two periods are easily distinguished. Nicholas V set his scholars, Poggio and Valla, to translate the Greeks, Herodotus and Thucydides, Aristotle and Diodorus. The feature of the later epoch is the number of Greek editions which came out to supplant the versions in common use. The credit for this advance in critical scholarship must be given to Aldus for his Greek Aristotle, which appeared in 1495-9; and he subsequently led the way with numerous texts of the Greek classics. At the same time he proposed to apply the same principle to Biblical study. As early as 1499 Grocin in a letter alludes to Aldus' scheme of printing the whole Bible in the original 'three languages', Hebrew, Greek and Latin; and a specimen was actually put forth in 1501.