Of Justice, three books. Of Temperance, one book. Of Piety, five books. Of Courage, one book. Of Virtue in general, one book. A second with the same title. Of Happiness, one book. Of Government, one book. On Laws, one book, and on subjects kindred to these. Of Names, one book. Agreements, one book. On the Involuntary, one book. Concerning Love, and Clinias, one book. 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. To grammar and criticism belong : Of the Age of Homer and Hesiod, two books Of Archilochus and Homer, two books. Of a literary nature are : A work on passages in Euripides and Sophocles, three books.