Fols. 5–12 form a quire of four folded bifolia still intact. Continuing through the manuscript, folios of the same stock, ruled for text appear as fols. 17, 19, 21, 23, 25–342*, 44–70. Fols. 26–27 and fols. 30–31 remain intact as bifolia, hinting at a further four quires of four folios. The consecutive foliation indicates that they were at the centre of the quire. Further complete bifolia are visible at fols. 53–54, fols. 58–59 and fols. 65–66. Fols. 48–51 form an intact quire of two bifolia. It should be noted that fols. 50–51 are double-thickness parchment. Two pieces, bearing the fifteenth-century drawings and volvelle, have been stuck together to give extra rigidity. This construction recognises the vulnerability of the volvelle's moving parts whilst also ensuring that the image of the temperaments on fol. 51v is not disturbed by a knotted thread.

The remainder of the parchment appears to be of a different type and does not feature the ruled lines of the medieval parchment stock. The folios are all singletons, those at the beginning of the book carrying the later royal portraits, with the exception of conjugate fols. 344*–345*, fols. 347*–36, fols. 40–41, and fols. 71–72. The parchment folios of the book end with the folded declaration numbered as fol. 119 and fol. 120 and a final list of Guild members’ signatures on fols. 122–1241*, numbers 122 and 123 being a bifolium. A single folio, foliated in ink as fol. 331 has been bound within the bifolium formed of fols. 347*–36. Its partner, once foliated as fol. 34, has been excised; together they may have formed the middle bifolium of a quire.