The first dialogue in the third tetralogy is the Parmenides, or a dialogue of Ideas, a logical one. The second is the Philebus, or on Pleasure, a moral one. The Banquet, or on the Good, a moral one. The Phædrus, or on Love, a moral one.
The fourth tetralogy opens with the Alcibiades, or a treatise on the Nature of Man, a midwife-like work. The second Alcibiades, or on Prayer, a piece of the same character. The Hipparchus, or on the Love of Gain, a moral one. The Rival Lovers, or a treatise on Philosophy, a moral one.
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.