The talk of the two Sophists, though ironically admired while it is going on, is shown at the end to produce no real admiration, but the contrary _ib._ Mistaken representations about the Sophists--Aristotle's definition--no distinguishable line can be drawn between the Sophist and the Dialectician 210 Philosophical purpose of the Euthydêmus--exposure of fallacies, in Plato's dramatic manner, by multiplication of particular examples 211 Aristotle (Soph. Elench.) attempts a classification of fallacies: Plato enumerates them without classification 212 Fallacies of equivocation propounded by the two Sophists in the Euthydêmus _ib._ Fallacies--_à dicto secundum quid, ad dictum simpliciter_--in the Euthydêmus 213 Obstinacy shown by the two Sophists in their replies--determination not to contradict themselves 214 Farther verbal equivocations _ib._ Fallacies involving deeper logical principles--contradiction is impossible.--To speak falsely is impossible 215 Plato's Euthydêmus is the earliest known attempt to set out and expose fallacies--the only way of exposing fallacies is to exemplify the fallacy by particular cases, in which the conclusion proved is known _aliunde_ to be false and absurd 216 Mistake of supposing fallacies to have been invented and propagated by Athenian Sophists--they are inherent inadvertencies and liabilities to error, in the ordinary process of thinking. Formal debate affords the best means of correcting them 217 Wide-spread prevalence of erroneous belief, misguided by one or other of these fallacies, attested by Sokrates, Plato, Bacon, &c.,--complete enumeration of heads of fallacies by Mill 218 Value of formal debate as a means for testing and confuting fallacies 221 Without the habit of formal debate, Plato could not have composed his Euthydêmus, nor Aristotle the treatise De Sophisticis Elenchis _ib._ Probable popularity of the Euthydêmus at Athens--welcomed by all the enemies of Dialectic 222 Epilogue of Plato to the Dialogue, trying to obviate this inference by opponents--Conversation between Sokrates and Kriton 223 Altered tone in speaking of Euthydêmus--Disparagement of persons half-philosophers, half-politicians 224 Kriton asks Sokrates for advice about the education of his sons--Sokrates cannot recommend a teacher--tells him to search for himself 225 Euthydêmus is here cited as representative of Dialectic and philosophy 226 Who is the person here intended by Plato, half-philosopher, half-politician? Is it Isokrates? 227 Variable feeling at different times, between Plato and Isokrates 228 CHAPTER XXII. MENON. Persons of the Dialogue 232 Question put by Menon--Is virtue teachable? Sokrates confesses that he does not know what virtue is. Surprise of Menon _ib._ Sokrates stands alone in this confession. Unpopularity entailed by it 233