Somewhat later--about the year 1410--the tone of Hus's writings changes. He no longer writes as an unconditional adherent of the Church of Rome, and the influence of Wycliffe's ideas gradually becomes evident. Hus's writings, still mainly Latin, are numerous at this period; they deal with then current theological controversies, and it would be of little interest to enumerate their titles. One of these treatises, addressed to a countryman of Wycliffe, entitled _De Libris Hæreticorum Legendis; Replica contra Anglicum Joannem Stokes_, deals almost entirely with Wycliffe's doctrine. John Stokes, a licentiate of law, was a member of an English embassy which was sent to Bohemia by King Henry IV. It was rumoured at Prague that Stokes had during his stay there stated that Wycliffe was in England considered a heretic. Hus immediately challenged the Englishman to a public disputation before the university in the then customary manner. On the refusal of Stokes to attend the meeting, Hus yet delivered his speech in defence of Wycliffe before the university, and afterwards founded his pamphlet principally on the contents of the speech. Many of the minor Latin writings of Hus are indeed based on speeches delivered before the university, and even in his larger Bohemian writings he has often introduced large portions of his sermons. Of Hus's Latin works, as already mentioned, the treatise _De Ecclesia_ requires particular notice. The work, written when Hus was exiled from Prague, and probably finished in the year 1413, is to a great extent a transcript of Wycliffe's work on the same subject, and has therefore little literary interest. But neither the events of the life of Hus nor the ideas expounded in his Bohemian works are intelligible without some knowledge of the treatise _De Ecclesia_. The Roman Catholic hierarchy, far more powerful and far less dependent on public opinion in the fifteenth century than in the present day, could not but see that--independently of all dogmatic differences of opinion--the acceptation of views such as those contained in the treatise _De Ecclesia_ must necessarily produce a fundamental change in the organisation of the Church.