THIS article attempts to clear the ground for determination of the authorship of the English Wyclifite tracts and sermons, which in turn will involve a study of the early centers of Lollardy other than Oxford. The pertinence of the date of the composition of the English Wyclifite sermon collection to the canon of Wyclif's English works is obvious. E. P. Jones, in the only study devoted solely to the canon of Wyclif's English works, believes the 294 sermons of the collection to have been written by Wyclif and uses, for the most part, their syntactical peculiarities to determine whether Wyclif wrote some of the English didactic and polemical works ascribed to him.' The only edition of the entire collection, which, of course, Jones used, follows the sermon compilation in MS. Bodl. 788,2 since the individual sermons, in that collection as well as the groups of sermons,3 are more complete than those in the other twenty manuscripts. However, Bodl. 788, in contrast to some of the other manuscripts, is probably a comparatively late compilation,4 since its sermons, as this article shows, were written, or at any rate enlarged, over a period of years from ca 1377 to ca 1412. Since there is nothing in the style or dialect of those sermons which distinguishes the earlier portions from other portions, or from later tropological additions, some other method of ascribing English works to Wyclif must be found. Jones's work, moreover, and the work upon which it is based, Thomas Arnold's ascription of the sermons to Wyclif,s are the only considerations of the authorship of these sermons which can not be considered obiter dicta. Gotthard Lechler suggests that a large number of the sermons were preached by Wyclif in the last years of his life and that Purvey transcribed, collected, and preserved many of them.6 F. D. Matthews agrees with Arnold.7 H. B. Workman considers some of