2. _De Astris_, a book on astronomy, written apparently in connexion with the rectification of the calendar, B.C. 46, perhaps in Greek. Suetonius says nothing about it, but it was known to Macrobius, _Saturn._, i. 16, 39, 'Iulius Caesar ... siderum motus, de quibus non indoctos libros reliquit, ab Aegyptiis disciplinis hausit.' The _liber de computatione_ and _liber fastorum_, attributed to Caesar by the Scholiast on Lucan, x. 185, 187, may have formed part of the _De Astris_. 3. _Anticatones_, written B.C. 45, in reply to Cicero's panegyric on Cato, with flattering references to Cicero himself. Sueton. _Iul._ 56, 'Reliquit et de Analogia duos libros et Anticatones totidem. ... Sub tempus Mundensis proelii fecit.' Cicero expresses himself as highly pleased with the book, _ad Att._ xiii. 51, 'bene existimo de illis libris, ut tibi coram'; but his tone is different in _Topica_, 94, 'quibus omnibus generibus usus est nimis impudenter Caesar contra Catonem meum.' 4. _Apophthegmata_, a collection of notable sayings, probably growing out of the _Dicta Collectanea_ of Sueton. _Iul._ 56, and completed B.C. 46-5. Cic. _ad Fam._ ix. 16, 4, 'audio Caesarem, cum volumina iam confecerit ἀποφθεγμάτων, si quod afferatur ad eum pro meo, quod meum non sit, reicere solere.' 5. _Letters._--In the time of Suetonius, Caesar's official despatches to the Senate were extant, and also private letters to Cicero and other friends, _e.g._ his confidants Balbus and Oppius. In these a cypher was, where necessary, employed. Cf. Sueton. _Iul._ 56, and Gell. xvii. 9, 1. 6. _Speeches._--About a dozen titles of speeches are known, but only a few detached words and phrases survive. As an orator, Caesar stood in the front rank (Sueton. _Iul._ 55). For encomiums on his style see Cic. _Brut._ 252, and Quintilian, x. 1, 114, who considered him second only to Cicero, and remarkable for _vis_, _acumen_, _concitatio_, and _elegantia_. The language of Tac. _Dial._ 21 is less complimentary, 'Nisi forte quisquam aut Caesaris pro Decio Samnite aut Bruti pro Deiotaro rege ceterosque eiusdem lentitudinis ac teporis libros legit, nisi qui et carmina eorumdem miratur.' 7. _Poems._--Caesar in his youth composed a poem in praise of Hercules, and a tragedy, _Oedipus_. Plutarch (_Caes._ 2) speaks of him as reciting poems of his own composition to the pirates who took him prisoner. On his journey from Rome to Spain, B.C. 46, he wrote a descriptive poem with the title of _Iter_. Sueton. _Iul._ 56, 'Reliquit ... poema quod inscribitur Iter ... [fecit] dum ab urbe in Hispaniam ulteriorem quarto et vicensimo die pervenit ... Feruntur et a puero et ab adulescentulo quaedam scripta, ut Laudes Herculis, tragoedia Oedipus, item Dicta Collectanea: quos omnes libellos vetuit Augustus publicari, in epistula quam brevem admodum ac simplicem ad Pompeium Macrum, cui ordinandas bibliothecas delegaverat, misit.'