HUG 2, ff. 060r-65v, inc. AE = a EB = b EC = c
Incipit:AE = a EB = b EC = c
Ff. 64bis-ter seem to be folios from the book that formerly became loose and then were pressed, giving them a different texture, before being sewn in again during the earlier restoration. Behind f. 64ter, two folios removed; behind f. 65, one folio removed. On Alhazen's problem; cf. OC 20:265-9.