EXPLANATION OF SYMBOLS.

M = The Munich codex 427, made of paper, assigned to the 10th century by Hardt, though perhaps it should be assigned to the 11th or 12th. The 239 folios were written with a uniform ductus of letters by the same hand, with few and rarely used abbreviations. The margins left are wide, in which only a few notes were added, perhaps by a later hand, though it is generally difficult to distinguish this from the first hand. Both the lines and letters of the geometric figures were drawn in red ink, though almost all with less diligence; for the person who made them did not look at the words of Proclus, but drew the figures he had before his eyes with little accuracy.

G = The first edition of Proclus's commentaries, which was added through the work of Simon Grynaeus to the Greek edition of Euclid's elements. Basel, at the shop of Ioannes Hervagius, in the year 1533.

C = A certain unknown corrector, who amended a copy of the first edition—formerly inserted into the books of Petrus Victorius, now kept in the Munich library under the shelfmark A. Gr. 1060—in many places, as much as can be conjectured, 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 manuscript book deposited in the Munich library under the shelfmark cod. lat. 6, containing on the first 154 folios the four books of Proclus's commentaries, translated by Bartholomaeus Zambertus of Venice (completed in the year 1539, in the 66th year of the translator).

B = The four books of Proclus's commentaries on the first book of Euclid's elements, edited by Franciscus Barocius, a Venetian patrician, Padua 1560.

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