Book 5
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Others are physical treatises: Of Reason. Of the Soul, and a separate treatise with the same title. Of Nature. Of Images. Against Democritus. Of Celestial Phenomena, one book Of Things in the Under-world. On Various Ways of Life, two books. The Causes of Diseases, one book. Of the Good, one book. Against Zeno’s Doctrines, one book. A Reply to Metron’s Doctrines, one book.
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To grammar and criticism belong: Of the Age of Homer and Hesiod, two books Of Archilochus and Homer, two books.
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Of a literary nature are: A work on passages in Euripides and Sophocles, three books. On Music, two books.
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Solutions of Homeric Problems, two books. Of Theorems, one book. On the Three Tragic Poets, one book. Characters, one book. Of Poetry and Poets, one book. Of Conjecture, one book. Concerning Prevision, one book. Expositions of Heraclitus, four books. Expositions in Reply to Democritus, one book. Solutions of Eristic Problems, two books. Logical Proposition, one book. Of Species, one book. Solutions, one book. Admonitions, one book. A Reply to Dionysius, one book.
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To rhetoric belongs: Of Public Speaking, or Protagoras.
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To history: On the Pythagoreans. Of Discoveries.
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Some of these works are in the style of comedy, for instance the tracts On Pleasure and On Temperance; others in the style of tragedy, as the books entitled Of those in Hades, Of Piety, and Of Authority.
