The second great work of Jungmann that ranks with his history of Bohemian literature is his vast dictionary of the Bohemian and German languages, published in five large volumes between 1835 and 1839. Jungmann's preparatory studies, both for this work and for the History, however, began as early as the year 1800. The work is a monument of indomitable energy and application. A work such as that of Jungmann would, if undertaken by a whole academy, have been most meritorious; but Jungmann worked almost alone, aided only in the merely mechanical part of his task by a few students of the University of Prague. His difficulties cannot be compared with those which the compiler of a dictionary of a more developed language encounters. A large part of ancient Bohemian literature, that within the last fifty years has been carefully edited and published, could then only be found in MSS. that were often difficult of access. Jungmann's work contains words that he only found once or twice in his sources; it was his desire to include all, for he laboured not only for the then scanty readers who wished to study the works of ancient Bohemian literature, but also for the modern Bohemian writers, whose vocabulary he endeavoured to enlarge. Even now, when Bohemian literature has obtained an almost miraculous development, Jungmann's dictionary has not been superseded; and the same, as regards completeness at least, can be said of his _History of Bohemian Literature_. The originators of the Bohemian revival, drawn together by a common passionate love for the national language, were mostly on terms of intimacy, and their correspondence, very voluminous, as was formerly the custom, gives a very clear insight into the views of the writers, and the disheartening circumstances under which they pursued their work. Of Jungmann's letters, the most interesting are those addressed to Kollar, who will be mentioned presently, and to Anthony Marek, an intimate friend of Jungmann, who was one of the minor Bohemian writers of this period. The degree of intimacy which existed among the small band of patriots is well described in one of Jungmann's letters to Kollar, written in February 1821: "I am writing to-day," he says, "to our dear Šafařik also, and to Palacký. You three form indeed my most beloved Trinity." The general impression of Jungmann's letters is distinctly a depressing one. The writer refers constantly to the incessant, often very puerile, vexations which he encountered from the Austrian authorities. Jungmann complains incessantly of the "censors", and we shall find the same complaints later when dealing with Palacký. Every book published in Austria had at that period to be previously submitted to the "censure-office" for inspection. There were two "censors" to each book, one of whom had to guard against anything contrary to the views of the Austrian Government being printed, while the other suppressed everything contrary to the teaching of the Church of Rome.