X. denotes the consensus of Orelli’s mss.

Mus. denotes the consensus of the Museum mss, so far as the contrary is not stated.
[] The present editor, thinking it more satisfactory that the evidence for each reading should be given in a positive form, has made use of square brackets to signify that the mss denoted by the inclosed letters are presumed, ex silentio on the part of previous editors, to show a given reading.
+ denotes that the same reading occurs in other mss besides those cited. Or. The revised Orelli, 1861.
Ba. Stereotype ed. of Baiter, 1864.
Sch. Schdmann’s 4th ed. 1876.
Mu. C.F. W. Miiller’s ed. 1878,
edd. denotes the consensus of the four editions. It is always stated when the reading in one of these differs from that of the text.
Ed, denotes that the present editor is responsible for a reading,