This servile devotion to Cicero, it should be recalled, was a marked departure from the more varied and richer curricula of the fifteenth-century humanists,[6] when men of the stamp of Vittorino da Feltre, Leonardo Bruni, Vergarius, Sylvius, and Guarino were the standard-bearers of humanism. Many causes had conspired to bring about this decadence; and perhaps the most fundamental cause was the senseless worship of forms of expression. The later humanists worshipped the _forms_ of thought. “Beauty of expression,” says Professor Laurie,[7] “was regarded as inseparable from truth and elevation of thought. The movement soon shared the fate of all enthusiasms. The new form was worshipped, and to it the spirit and substance were subordinated. Style became the supreme object of the educated classes, and successful imitation, and thereafter laborious criticism, became marks of the highest culture.” This use of the classics as instruments in grammatical drill and vehicles of communication had become well-nigh universal by the middle of the sixteenth century. Erasmus, himself one of the most ardent advocates of classical learning, perceived apparently the narrowing tendencies of humanistic training, and urged that students be taught to know many things besides Latin and Greek in order that they might the better comprehend the classics. He recommended the addition of geography, arithmetic, and natural science to the school course. And Melanchthon, with all his enthusiasm for classical learning, thought the humanities insufficient to satisfy all the needs of culture. He advised the incorporation of physics, mathematics, and astronomy into the curriculum. “Although the nature of things cannot be absolutely known, nor the marvellous works of God traced to their original, until, in the future life, we shall listen to the eternal counsel of the Father,” he writes, “nevertheless, even amid this our present darkness, every gleam and every hint of harmony of this fair creation forms a step toward the knowledge of God and toward virtue, whereby we ourselves shall also learn to love and maintain order and moderation in all our acts. Since it is evident that men are endowed by their Creator with faculties fitted for the contemplation of nature, they must, of necessity, take delight in investigating the elements, the laws, the qualities, and the forces of the various bodies by which they are surrounded.” As has already been shown, however, the humanists took little interest in the study of subjects not discussed by classical authors. Absorbed in a world of books, as Mr. Quick[8] suggests, they overlooked the world of nature. Galileo had in vain tried to persuade them to look through his telescope, but they held that truth could not be discovered by any such contrivances—that it could be arrived at only by the comparison of manuscripts. “No wonder,” remarks Mr. Quick, “that they had so little sympathy with children, and did not know how to teach them.”