and Menexenus or The Funeral Oration, which is ethical. The eighth tetralogy starts with Chtophon or Introduction, which is ethical, and is followed by the Republic or On Justice, political, Timaeus or On Nature, a physical treatise, and Critias or Story of Atlantis, which is ethical. The ninth tetralogy starts with Minos or On Lan, a political dialogue, which is followed by the Laws or On Legislation, also political, Epinomis or Nocturnal Council, or Philosopher, political, and lastly the Epistles, thirteen in number, which are ethical. In these epistles his heading was “ Welfare,” as that of Epicurus was “ A Good Life,’ and that of Cleon “ All Joy.” They comprise : one to Aristodemus, two to Archytas, four to Dionysius, one to Hermias, Erastus and Coriscus, one each to Leodamas, Dion and Perdiccas, and two to Dion’s friends. This is the division adopted by Thrasylus and some others. Some, including Aristophanes the grammarian, arrange the dialogues arbitrarily in trilogies. In the first trilogy they place the Republic, Timaeus and Critias ; in the second the Sophist, the Statesman and Cratylus; in the third the Lams, Minos and Epinomis ; in the fourth Theaetetus, Euthyphro and the Apology ; in the fifth Crito, Phaedo and the Epistles. The rest follow as separate compositions in no regular order. Some critics, as has already been stated, put the Republic first, while others start with the greater Alcibiades, and others again with the Theages ; some begin with the Euthyphro, others with the Clitophon ; some with the Timaeus, others with the Phaedrus ; others again with the Theaetetus, while many begin with the Apology. The following dialogues are acknowledged to be spurious: the Mzdon or Horse-