Quoted from the Editor's "Introduction to the Hipparchus."
"ALTHOUGH this dialogue is found in the list given by Diogenes Laertius, iii. 50, of the genuine productions of Plato, yet even before the time of AElian, there was some idea of its being spurious. For after quoting it in V. H. viii. 2, the writer adds, "if it be in reality Plato's." Carrying out this hint, Valckenaer was the first to prove, on Herodotus v. 55, that it was not written by its previously-supposed author; and his decision has been admitted by Wolf in Prolegom. Homer. p. cliv., and all the subsequent scholars who have written upon Plato, with the exception of Taylor; who says he "cannot find any thing in its manner or matter, for which
its authenticity deserves to be called in question." Boeckh indeed attributes it to Simon the shoemaker, who was a Socratic philosopher, ridiculed probably by Aristophanes, in the Clouds; but Stalbaum would bring it down to the time, when schools of rhetoric were in vogue towards the decline of Greek literature, and he considers it inferior to even the Theages and Rivals, despite the preservation of the anecdote relating to Hipparchus in § 4, who has given the name to the dialogue, and was once thought to have been introduced as a speaker, until, to avoid the anachronism, an unknown friend was substituted in his place."