Complete Works of Euclid, Vol. 6 (Optics, Catoptrics, etc.)

is said, in which book he also added some things between the lines; he defiled the first same leaves of the codex. From folio 245^a (X, 91) all more recent hands cease (see schol. X, 91 no. 405).

b — scholia of codex b by the first hand, sometimes in smaller letters.
b^1 — scholia of codex b by an old hand in livid ink.
b^2 — scholia ascribed in b by the hand of Theodore Cabasilas.
b^3 — scholia of codex b written by a more recent hand; but perhaps b^2 and b^3 are the same hand; for I have little confidence in my rapidly completed collation regarding the distinguishing of the more recent hands of this codex.
$β$ $β^2$ $β^3$ — I have noted the hands of b, b^2, b^3, where in the earlier part of the codex, which contains only definitions and propositions, they have added scholia.
V^a — scholia of codex V written by the same hand that wrote out the codex itself from fol. 235 onwards; it is sometimes finer.
V^b — scholia of codex V written by the hand that wrote the earlier part of the codex. It is sometimes more negligent in the scholia, nor does it always use the same ink; but that it is the same hand is apparent from fol. 131^a—132^r, where the writing becomes gradually more negligent. I have also referred to this certain notes written in dark ink, in which this hand, or one certainly very similar, affects a more elegant and diligent script. That V^b wrote its scholia after V^a can be deduced from the fact that somewhere a scholium of hand V^b is interrupted by some mark ($κε\acute{ι}μεν oν$) of hand V^a.
V^c — scholia of codex V, fol. 283—292, written by hand V^a.
V^1 — scholia of codex V by a sufficiently old hand in