Bryson is mentioned by Theopompus ap. Athenæum, xi. p. 508 D. Theopompus, the contemporary of Aristotle and pupil of Isokrates, had composed an express treatise or discourse against Plato's dialogues, in which discourse he affirmed that most of them were not Plato's own, but borrowed in large proportion from the dialogues of Antisthenes, Aristippus, and Bryson. Ephippus also, the comic writer (of the fourth century B.C., contemporary with Theopompus, perhaps even earlier), spoke of Bryson as contemporary with Plato (Athenæ. xi. 509 C). This is good proof to authenticate Bryson as a composer of "Sokratic dialogues" belonging to the Platonic age, along with Antisthenes and Aristippus: whether Theopompus is correct when he asserts that Plato borrowed _much_, from the three, is very doubtful. Many dialogues were published by various writers, and ascribed falsely to one or other of the _viri Sokratici_: Diogenes (ii. 64) reports the judgment delivered by Panætius, which among them were genuine and which not so. Panætius considered that the dialogues ascribed to Plato, Xenophon, Antisthenes, and Æschines, were genuine; that those assigned to Phædon and Eukleides were doubtful; and that the rest were all spurious. He thus regarded as spurious those of Alexamenus, Kriton, Simmias, Kebês, Simon, Bryson, &c., or he did not know them all. It is possible that Panætius may not have known the dialogues of Bryson; if he did know them and believed them to be spurious, I should not accept his assertion, because I think that it is outweighed by the contrary testimony of Theopompus. Moreover, though Panætius was a very able man, confidence in his critical estimate is much shaken when we learn that he declared the Platonic Phædon to be spurious.] [Footnote 5: Diogen. Laert. i. 62-65; Athenæus, xi. p. 507 C. Dion Chrysostom (Orat. lv. De Homero et Socrate, vol. ii. p. 289, Reiske) must have had in his view some of these other Sokratic dialogues, not those composed by Plato or Xenophon, when he alludes to conversations of Sokrates with Lysikles, Glykon, and Anytus; what he says about Anytus can hardly refer to the Platonic Menon.] [Side-note: Æschines--oration of Lysias against him.]