6. _Epistulae morales ad Lucilium_. These were addressed to Lucilius Iunior, the author of 'Aetna' (see p. 277). There are extant one hundred and twenty four letters, in twenty Books, but some Books have been lost, as Gell. xii. 2, 3 quotes from Book xxii. Books i.-iii. were probably published by Seneca, the rest after his death, generally in chronological order. The following poetical works are extant: 1. _Epigrams._--Nine on his exile are given in the editions; probably only Nos. 1, 2, and 7 are genuine. 2. _Tragedies._--Some of these may have been composed during Seneca's exile in Corsica. See _ad Helv._ 20 (quoted p. 243). The metrical treatment is strict, especially in the senarii. Anapaestic, glyconic, sapphic lines, etc., are used in the choral odes. There are only three actors, except in the spurious _Octavia_. The plays are: (1) _Hercules Furens_ and (2) _Troades_ or _Hecuba_, founded on Euripides. (3) _Phoenissae_ or _Thebais_. The two parts do not correspond. In ll. 1-362, Oedipus and Antigone are on their way to Cithaeron; from l. 363 to the end we find Iocasta and Antigone in Thebes while it is besieged by the Seven. (4) _Medea_, founded on Euripides. Ovid has also been imitated; so ll. 56 _sqq._ from Ovid, _Heroides_, 12, 137. (5) _Phaedra_ or _Hippolytus_. (6) _Oedipus_, after Sophocles. (7) _Agamemnon_, after Aeschylus. (8) _Thyestes_. (9) _Hercules Oetaeus_, of which the second part, at least, is spurious. (10) _Octavia_, a praetexta, describing the death of Octavia, Nero's wife (A.D. 62). Seneca himself appears in it. It cannot be by Seneca, as Nero's downfall (A.D. 68) is mentioned in ll. 628-36. The following works are lost or exist only in fragments: i. Poems of a light nature (Pliny, _Ep._ v. 3). 2. _De motu terrarum_, afterwards incorporated in _N.Q._ vi. (see _N.Q._ vi. 4, 2). 3. _De lapidum natura_. 4. _De piscium natura_. 5. _De ritu et sacris Aegyptiorum_ (see p. 242). 6. _De situ Indiae_. 7. _De forma mundi_. 8. _Exhortationes_. 9. _De officiis_. 10. _De immatura morte_. 11. _De superstitione dialogus_. 12. _De matrimonio_. 13. _De amicitia_. 14. _De vita patris_, along with an edition of his works. 15. Speeches by himself or by Nero. 16. _Epistulae_ (a) _ad Novatum_, probably written from Corsica, (b) _ad Caesonium Maximum_. 17. A book in praise of Messalina, afterwards withdrawn (see p. 243). 18. _Moralis philosophiae libri_ (see _Ep._ 106, 2). 19. _De remediis fortuitorum_, addressed to Gallio. A synopsis with additions is extant. 20. _De paupertate_. 21. _De formula honestae vitae_, probably founded on one of Seneca's works. 22. _Notae_ (see Sueton. pp. 135-6 R.). The following are spurious works: