The first dialogue in the fifth is the Theages, or another treatise on Philosophy, another midwife-like work. The Charmides, or on Temperance, a tentative essay. The Laches, or on Manly Courage, midwife-like. The Lysis, or a dissertation on Friendship, also midwife-like.
The sixth tetralogy commences with the Euthydemus, or the Disputatious Man, a distinctive dialogue. Then comes the Protagoras, or the Sophists, a demonstrative one. The Gorgias, or a dissertation on Rhetoric, another distinctive one. And the Meno, or on Virtue, a tentative dialogue.
The seventh begins with the two Hippias’s. The first being a dissertation on the Beautiful, the second one on Falsehood, both distinctive. The third is the Ion, or a dissertation on the Iliad, a tentative one. The fourth is the Menexenus, or the Funeral Oration, a moral one.
The first dialogue in the eighth is the Clitophon, or the Exhortation, a moral piece. Then comes the Republic, or the treatise on Justice, a political one. The Timæus, or a dissertation on Nature, a dialogue on Natural Philosophy. And the Critias, or Atlanticus, a moral one.
The ninth begins with the Minos, or a treatise on Law, a political work. The Laws, or a dissertation on Legislation, another political work. The Epinomis, or the Nocturnal Conversation, or the Philosopher, a third political one.
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.