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

f — scholia of the Laurentian codex XXVIII, 6, parchment, 13th—14th century, which was transcribed from V (see p. XXVI). They are written by the first hand in the text itself and correspond for the most part to the hands Vᵃ Vᵇ V¹.

f¹ — scholia of codex f later added in the margin by a recent hand.

l — scholia of the Laurentian codex XXVIII, 2, paper, 13th—14th century, for the most part written by the first hand, though some were written by two more recent hands.

λ — scholia of the Laurentian codex XXVIII, 8, parchment, 14th century, written by the first hand. Fols. 3—6 of the codex are occupied by certain scholia (fols. 1—2 contain some mathematical material written negligently; fol. 7 contains two figures; only on fol. 8 does Book I of the Elements begin).

Maglb. — scholia of the Magliabecchian Library codex of Florence XI, 53, paper, 15th century, written by the first hand.

q — scholia of the Parisian codex 2344 (q) written by the first hand; the ductus of the letters and the color of the ink sometimes differ slightly both from each other and from the hand of the text, yet not so much that one could think of another hand.

qᵃ — scholia of codex q added very rarely by a slightly more negligent hand, but one which is close to the hand of l.

qᵇ — scholia of codex q written by another old hand, also very rare.

qᶜ — scholia of codex q written by the hand of l on fols. 358—366.

q¹ — scholia of codex q written here and there by a sufficiently old hand with a neat ductus in very black ink.