EXPLANATION OF THE SIGNS.

M = The Munich codex 427, on paper, attributed by Hardt to the 10th century, but perhaps to be attributed to the 11th or 12th. The 239 folios were written out with an equal duct of letters by the same hand, with few and rarely used abbreviations. Wide margins have been left, in which only a few notes were added, perhaps by a later hand, which is however generally difficult to distinguish from the first hand. Both the lines and letters of the geometric figures have been drawn in red ink, though almost all with less care; for he who finished those did not consult Proclus’s words, but drew the figures he had before his eyes with little accuracy.

G = The first edition of Proclus’s commentaries, which was added by the work of Simon Grynaeus to the elements of Euclid edited in Greek at Basel by Johann Hervagius in the year 1533.

C = A certain unknown corrector, who, in many places—as much as can be conjectured—corrected a copy of the first edition, once inserted into the books of Petrus Victorius, now kept in the Munich library under the sign A. Gr. 1060, from a codex very similar to codex M. We should not be surprised that he did not see or provide the truth everywhere.

Z = A handwritten book deposited under the sign cod. lat. 6 in the Munich library, containing in the first 154 folios four books of Proclus’s commentaries translated by the Venetian Bartholomaeus Zambertus (finished in the year 1538, in the 66th year of the translator).

B = Four books of commentaries of Proclus on the first book of Euclid’s elements, edited by the Venetian patrician Franciscus Barocius, Padua 1560.

B₁ = The Bologna codex of the library of S. Salvator 223 (Kn. III, p. 5).