XXXVI. And this last tetralogy is completed by thirteen epistles, all moral; to which is prefixed as a motto, εὖ πράττειν, just as Epicurus inscribed on his εὖ διάγειν, and Cleon on his χαίρειν. They are, one letter to Aristodemus, two to Archytas, four to Dionysius, one to Hermeias, Erastus, and Coriscus, one to Leodamas, one to Dion, one to Perdiccas, and two to the friends of Dion.
XXXVII. And this is the way in which some people divide his works. But others, among whom is Aristophanes, the grammarian, arrange his dialogues in trilogies; and they make the first to consist of the Republic, the Timæus and the Critias.
The second of the Sophist, the Statesman, the Cratylus.
The third of the Laws, the Minos, the Epinomis.
The fourth of the Theætetus, the Euthyphro, the Defence of Socrates.
The fifth of the Crito, the Phædo, the Epistles.
And the rest they arrange singly and independently, without any regular order. And some authors, as has been said already, place the Republic at the head of his works: others begin with the Greater Alcibiades: others with the Theages; some with the Euthyphro, others with the Clitophon; some with the Timæus, some with the Phædrus, others again with the Theætetus. Many make the Defence of Socrates the first piece.
There are some dialogues attributed to him which are confessedly spurious. The Midon, or the Horse-breeder; the Eryxias, or Erasistratus; the Alcyon; the Acephali, or Sisyphi; the Axiochus; the Phæacians; the Demodorus; the Chelidon; the Seventh; the Epimenides. Of which the Alcyon is believed to be the work of a man named Leon; as Phavorinus tells us in the seventh book of his Commentaries.