has also been corrected by a later hand, and sometimes the correct reading appears as follows: μόνος is corrected to όμοιος in section 6. The Aldine edition corresponds in error with the manuscripts to such an extent that it is clearly derived from the same source. In a number of places it gives a different reading, frequently the correct one, e.g., χρώμασι for χρώμ^να in section i, but it is not certain whether these changes are due to the skill of the editor or are derived from some other source which has not survived. The most difficult problem occurs in section 20, where Aldus is the sole source for ov, which is written as an abbreviation before κισσηροΰται. Wimmer accepts this, though the manuscripts have ή or ή. There is no evidence that Aldus derived this from another source, and it may be a misprint. He is of no assistance in filling the difficult gaps in the manuscripts, such as the one in section 8 between σχεδόν and λόγον; but though his text contains many misprints, he is frequently helpful in supplying the right reading.
Schneider thinks highly of Turnebus and often accepts his conjectures; Heinsius tends to follow Furlanus, who was not as good an editor as Turnebus. Hill's text is too full of misprints to be reliable.
The variant readings of the three manuscripts and the Aldine edition have been listed wherever they differ from Wimmer's text. Some minor variations in spelling that appear in the manuscripts and some obvious misprints made by Aldus have been omitted. Certain conjectures that appear in the six later editions or in other publications have also been listed, but variations that seem to be due to mistakes or misprints usually have not been included.
Though it is customary to use Latin for critical notes on a text, this has not been done here, since the book is intended for readers interested in science as well as for classical scholars; but for the sake of brevity the abbreviations "om.," "add.," and "conj." have been used for an omission, an addition, and a conjecture. Words added to the text are indicated by pointed brackets, words removed from the text are indicated by square brackets, and doubtful words are marked with a dagger. Since the editors differ