The _Janua_, more than any other book that he wrote, made Comenius’ name familiar to scholars throughout the world, and for more than a century it was the most popular secondary-school text-book in use. How came this book to confer on its author such world-wide fame? “Partly,” answers Raumer, “from the pleasure found in the survey of the whole world, adapted both to young and old, and at a day when no great scientific requirements were made. Many were amused by the motley variety of the imaginations and investigations of the book; by its old-fashioned grammatical, didactic, and rhetorical discussions, and its spiritual extravagances. The greatest influence was, however, exerted by the fundamental maxim of the book—that the knowledge of a language, and especially of the Latin, should go hand in hand with a knowledge of the things explained in it.”[37] _Atrium and Vestibulum_ The _Janua_ was followed in 1633 by the _Atrium_. It contains 427 short sentences somewhat more amplified than in the _Janua_. In the introduction the teacher promises to initiate the pupil into the mysteries of wisdom, the knowledge of all things, the ability to do right always, and to speak correctly of everything, especially in Latin, which, as a common language to all nations, is indispensable to a complete education. The foundation of things is laid in the _Vestibulum_ (subsequently published); the _Janua_ furnishes the materials for the building; and the _Atrium_ provides the decorations. With the completion of these, pupils may confer with the wisest authors through their books, and through this reading they may become learned, wise, and eloquent. The second part treats of substantives, as the classification of things; the third part of adjectives, as the modification of things; the fourth part explains pronouns; in the fifth part verbs are introduced; the sixth part discusses adverbs, the seventh part prepositions, the eighth part conjunctions, and the ninth part interjections. The tenth part contains examples of the derivation of words. The _Atrium_ was intended as a simplified Latin grammar to be used with the graded system of language teaching outlined by Comenius.