Complete Works of Euclid, Vol. 7 (Optics and Catoptrics)

but I have retained most of the errors, lest anything be detracted from the utility of the interpretation for restoring its Greek foundation; errors which cannot be referred back to the Greek codex I have usually corrected in the notes, and rarely in the text. I transcribed it myself.
L = British Museum codex Add. 17,368. Among other mathematical and astronomical works, it has the same interpretation on ff. 60—69^r. I inspected some passages.
M = Marcian codex lat. 332, 13th century. I inspected it.
Regarding the classification of these codices, see Prolegomena I.

II. I have taken the Scholia on the genuine Optics almost exclusively from V (no. 54 also in Vat.^1, no. 72 and 78 also in A, no. 89 from A alone), where they are written carelessly by the hands V^a V^b V^1 V^2, concerning which see V p. XI—XII. Some things in the codex have been deleted or erased; minor things that could not be read with sufficient certainty, I have omitted. There can be no doubt that all the scholia originated from the scribes of the codex themselves; wherefore they are no older than the 12th century.

III. In Theon’s recension of the Optics:
V = Vatican codex Gr. 204, parchment, 10th century, concerning which see V p. XII. It has the Optics on ff. 42^v—58^r, corrected by a later hand (V m. rec.).
v = Vatican codex Gr. 191, bombycine, 13th—14th century, concerning which see Parthey, Monatsberichte der Berliner Academie 1863 p. 374 sq.
p = Paris codex Gr. 2390, bombycine, 13th century; see Omont, Inventaire II p. 251. It has the Optics on ff. 265—275.
I have collated all of them myself.