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.
10. History of Literature and the Drama.—De poetis, De poematis, De lectionibus, De bibliothecis, De proprietate scriptorum, De personis, De descriptionibus, De actis scenicis, De scenicis actionibus, De originibus scenicis, Quaestiones Plautinae. In the Hebdomades or Imaginum Libri xv. Varro gave short accounts in prose and verse of seven hundred famous Greeks and Romans, with their portraits (Plin. N.H. xxxv. 11), the title being derived from the arrangement in groups of seven. Aristotle’s Πέπλος had dealt similarly with the heroes of the Trojan War, and the ‘Πεπλογραφία Varronis’ of Cic. ad Att. xvi. 11, 3 is usually identified with the Hebdomades.