NEW TEACHING METHODS. Such important changes naturally called for a progressively evolving series of printed textbooks, and these now came fast from the presses. The day of one textbook, which could dominate all instruction for hundreds of years, was over forever. A few books, such as Lily's or Melanchthon's Latin grammars and the textbooks of Erasmus, were still used for a long time, but throughout the sixteenth century, before the schools became formalized and lost their earlier purpose, each textbook issued was soon superseded by a better one. The invention of printing, too, changed teaching from a reading-by-the-professor to a textbook method, and tremendously shortened the time necessary to give instruction in any subject. With the manufacture of paper the written theme, too, displaced the disputation, with great gains in accuracy of thinking and refinement in the use of words. It was still the Latin theme or verse or oration, to be sure, and the object of the new instruction was to teach Latin as a living language, but before long the time was to come when the same methods would be transferred to instruction in the native tongues and for national ends. To make the instruction as practical as possible, and thus prepare the pupils for service as Latin scholars in public or scholarly pursuits, the ancient literature was studied in part as a storehouse of adequate and elegant expression, and numerous phrase books [17] were written for use in the schools. When we remember that Latin was still the language of all learned literature, of the university classroom, of most diplomatic and legal documents, and a practical necessity for travel or communication abroad, we can realize why so much emphasis was placed on the constant use of Latin as the language of the school. [18] As Leach [19] so well puts it: "The learned professions required a competent knowledge of Latin far more directly then than now. A need for Latin was not confined to the Church and the priest. The diplomatist, the lawyer, the civil servant, the physician, the naturalist, the philosopher, wrote, read, and to a large extent spoke and perhaps thought in Latin. Nor was Latin only the language of the higher professions. A merchant, or a bailiff of a manor, wanted it for his accounts; every town clerk or guild clerk wanted it for his minute book. Columbus had to study for his voyages in Latin; the general had to study tactics in it. The architect, the musician, every one who was neither a mere soldier nor a mere handicraftsman, wanted, not a smattering of grammar, but a living acquaintance with the tongue, as a spoken as well as a written language."