2. _Grammar._--Of the twenty-five books _De Lingua Latina_, only v.-x. have been preserved, but the scope of the whole is known from Varro's own words. Book i. was introductory; ii.-vii. dealt with etymology; viii.-xiii. with inflexions; xiv.-xxv. with syntax. Varro's derivations are ridiculed by Quintilian i. 6, 37, 'Sed cui non post Varronem sit venia, qui _agrum_ quia in eo _agatur_ aliquid, et _graculos_ quia _gregatim_ volent dictos voluit persuadere Ciceroni?' From Book v. onwards the work was dedicated to Cicero, in return for his _Academics_; it is announced in Cic. _Ac._ i. 2, where Varro says, 'Habeo opus magnum in manibus, idque iam pridem: ad hunc enim ipsum (me autem dicebat) quaedam institui, quae et sunt magna sane et limantur a me politius.' The date of publication was probably B.C. 45-3. Of the minor works on grammar, some at least were prior to the _De Lingua Latina_: Cic. _Ac._ i. 9, 'Plurimum poetis nostris omninoque Latinis et litteris luminis et verbis attulisti.' The titles known are, _De sermone Latino_, _De origine linguae Latinae_, _De similitudine verborum_, _De utilitate sermonis_, _De antiquitate litterarum_, Περὶ χαρακτήρων. 3. _Roman History and Antiquities._ Varro's great work in this department was the _Antiquitates rerum divinarum humanarumque_, in forty-one Books. The arrangement, according to Augustine _De Civ. Dei_, vi. 3, was as follows: (_a_) i.-xxv. _res humanae_; i. introductory, ii.-vii. history of Rome down to its capture by the Gauls, viii.-xiii. geography of Italy, xiv.-xix. Roman Calendar, with dates of the chief historical events, xx.-xxv. Roman institutions, (_b_) xxvi.-xli. _res divinae_; the persons who sacrifice, the places, the times, the rites, and the gods were discussed in three Books each, xxvi. being introductory. The second part, at least, was addressed to Caesar as _pontifex maximus_. As it is mentioned by Cic. _Ac._ i. 9, it must have been published before B.C. 45. Minor works under this head were _Annales_, _Res urbanae_, _De gente populi Romani_, _De vita populi Romani_, _De familiis Troianis_, _Tribuum Liber_; _Aetia_ (αἴτια), explaining Roman usages, in the form of a catechism; Εἰσαγωγικός to Pompey on the duties of a consul (B.C. 71), Gell. xiv. 7, 1; _De Pompeio_, _Legationum Libri_, _De sua vita_. 4. _Geography._-(_a_) _Ephemeris navalis_, addressed to Pompey before his departure for Spain about B.C. 77, a weather almanack for sailors; _Ephemeris rustica_ or _agrestis_, for farmers. (_b_) _Libri navales_, perhaps identical with the above, (_c_) _De ora maritima_. 5. _Law._--_De iure civili_ in fifteen Books. 6. _Rhetoric._--_Rhetorica_. 7. _Philosophy._-_De Forma Philosophiae_, _De Philosophia_. 8. _Mathematics_, etc.-_De mensuris_, _Mensuralia_, _De principiis numerorum_, _Libri numerorum_, _De geometria_, _De astrologia_. 9. _Disciplinae_ in nine Books, forming a complete course of education in the liberal arts.