Manuscript written in Scotland containing Books XXIII-XXXV of Pope Gregory I's 'Commentary on Job', also known as the 'Moralia, sive Expositio in Job', or the 'Magna Moralia'.

The manuscript was written in the 15th century, before 1483, at which date it was donated to Dunkeld Cathedral. Watermark evidence also suggests a date of the latter half of the 15th century.

The work is written in double columns on folios 1r-15v and in a single block of text from folios 16r-187r, with circa 43 lines to a page. The manuscript is possibly the work of two or more hands and is written in a cursive script.

Folio 188 is a flyleaf with material from a contemporaneous manuscript. The recto side contains entries beginning 'Jacobus etc reverendissimo in Christo patri ac domino Carli de lersinis...'. The verso side contains a verse in the same hand as the entries on the recto side, as well as ownership inscriptions in a later hand.

Folio 1r features a large blue floriated initial on yellow grounds relieved with white tracery. There is also a partial floral border with sprays in colours of blue, orange, green, and purple.

There are large penwork initials, in either red or blue with filigree penwork in red or blue, on the following folios: 10v, 22r, 32r.

Spaces have been left for larger initials on the following folios: 67r, 91v, 107v. Guide letters are often visible for the decoration.

Throughout the manuscript letters have been stroked with red and passages of text are frequently underlined in red.

The scribe has supplied a running number for each Book in the upper margin in Roman numerals.

The recto and verso of each folio has been lined in red.

There are horizontal catchwords throughout the manuscript, most often present on the verso side of the leaves, but also occasionally on the recto sides.

Quire signatures in the form of lower case letters with Arabic numerals are occasionally visible in the bottom right corner of the recto sides, but these are often cropped.

At folio 109v there is possibly a change of hand, and the style of decoration also differs, especially in the explicits and decorated initials, for example on folios 129v and 146r.

There is evidence of contemporary and modern repairs to the manuscript, as well as scribal erasures and corrections.