Quoted from the Editor's "Introduction to the Epistles."
"THE last portion of the works of Plato, that have been considered by some scholars to be spurious, and genuine by others, are the Epistles. These, according to Diogenes Laertius, iii. 61, were thirteen in number; and just so many have been found in different MSS, and addressed to the parties mentioned by Diogenes, with the exception of the 10th and 11th; which, he says, were written respectively to Aristodemus and Leodamas, instead of Aristodorus and Laodamas, as found at present --- a discrepancy evidently arising from
a literal variation merely.
Out of the whole number, all but 1, 10, 11, 12, have been quoted distinctly, or covertly alluded to, by different writers, commencing with Cicero, and ending with some of the Greek fathers. One, however, the 12th, addressed to Archytas, is reported in some MSS. to be spurious; although Diogenes, in viii. 79, states it was written in answer to the letter there preserved from Archytas to Plato.
As scarcely any thing has been written upon the Epistles, with the exception of the notes of Stephens, based for the most part on the version of Ficinus, I have been compelled to say more than I should otherwise have done, with the view of directing attention to passages, where, from the corruptions in the text, I have been unable to see my way clearly."