The sixth : Truth. Of Discussion : a handbook of debate. Satho, or Of Contradiction, in three books. On Talk. The seventh volume contains the following : On Education, or On Names, in five books. On the Use of Names : a controversial work. Of Questioning and Answering. Of Opinion and Knowledge, in four books. Of Dying. Of Life and Death. Of Those in the Underworld. Of Nature, in two books. A Problem concerning Nature, two books. Opinions, or The Controversialist. Problems about Learning. In the eighth volume are : On Music. On Commentators. On Homer. On Wickedness and Impiety. On Calchas. On the Scout. On Pleasure. The ninth volume contains : Of the Odyssey. Of the Minstrel's Staff. Athena, or Of Telemachus. Of Helen and Penelope. Of Proteus. Cyclops, or Of Odysseus.