On Music, two books. 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. To rhetoric belongs : Of Public Speaking, or Protagoras. To history : On the Pythagoreans. Of Discoveries. 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. Again, he has a sort of intermediate style of conversation which he employs when philosophers, generals and statesmen converse with each other. Furthermore, he wrote geometrical and dialectical works, and is, besides, everywhere versatile and lofty in diction, and a great adept at charming the reader's mind.