This early fifteenth-century paper and parchment manuscript contains three separate booklets that were written in hands of the second half of the fourteenth and the early fifteenth century. It has been described in detail by N. R. Ker. There seems to be no indication when and by whom the three booklets, Y/1-3, were joined, but all three contain sermons in random order.

Y/1 (ff. 1–197v) was written not long after 1404 (see below). Next to four homilies from St. Bernard's Super Missus est (ff. 139–149v), the Life of St. Brendan (ff. 166–175v), and a series of visions “de penis inferni et … de penis purgatorii” (ff. 188–197v), it contains close to a hundred items that mix sermons with articles on theological topics. The distinction between the two is not always easy to make, and this difficulty is enhanced by the fact that sometimes it is unclear where an item begins or ends. In addition, the ends of several sermons are copied in different parts of the booklet, with signes de renvoi. Pieces that can be considered to be sermons are themselves of two kinds. First there are items that have some or all of the normal parts of a scholastic sermon, such as thema, address, division, development of the principals, and closing formula. These parts are often carefully marked in the margins. There are roughly twenty-eight such items. But a much larger number come without thema.