The main contents are Huguitio's Summa super derivationibus and Isidore's Etymologies written in 2 cols. 4 flyleaves at the beginning and 4 at the end (like Ob 7) contain three- and four-part, apparently English motets. Concordances prove that the last 4 folios contain predominantly French works, including some in the French language and others by Philippe de Vitry. The 2 pieces in three-part score on f. 4v appear to be a slightly later addition to the repertory of Petronian motets, for they use Ars Nova notation.

brown leather over wooden boards; modern. 1 extra parchment flyleaf at each end belongs to this binding.

Petronian (f. 1-4); Ars nova (concluding flyleaves)

12 brown five-line staves per page at the beginning of the codex and 13 at the end. Staff height:13.5-14.5mm; systems 54-57.5 mm in threes

1-8v

modern pencil foliation at t.r.r.; the last 4 pages are wrongly numbered 336*, 337, 338, 339 instead of 337-340

blue-red initials

parchment

RISM B/IV 2: A 14th century parchment manuscript meas. 340 x 222 mm. and containing 340 folios. There is a modern pencil foliation at t.r.r., though the last 4 pages are wrongly numbered 336*, 337, 338, 339 instead of 337-340. The main contents are Huguitio's Summa super derivationibus and Isidore's Etymologies written in 2 cols, with blue-red initials. The 4 flyleaves at the beginning and the 4 at the end, which date from the mid-14th century, are like Ob 7 in containing three- and four-part, apparently English motets in Petronian notation on f. 1-4 and motets in Ars Nova notation on the concluding flyleaves. Concordances prove that the last 4 folios contain predominantly French works, including some in the French language and others by Philippe de Vitry. The 2 pieces in three-part score on f. 4v appear to be a slightly later addition to the repertory of Petronian motets, for they use Ars Nova notation. There are 12 brown five-line staves per page at the beginning of the codex and 13 at the end. Like the ms corpus, the music sections also employ blue-red initials. 1 extra parchment flyleaf at each end belongs to the modern binding of brown leather over wooden boards. There are 2 clasps, a gilt title on the spine and arms on the cover. DRc 20 was evidently bought for Durham by John Wessyngton, a prior there, presumably in the 14th century (cf. fol. 5).

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