Stangl in Tulliana et Mario-Victoriniana, Munich, 1888) is probably by him and not by Boetius, to whom it was formerly attributed.
Koffmann, De Mario Victorino philosopho Christiano (Breslau, 1880); R.
Geffcken, Lex Salica (Leipzig, 1898), the text in 65 chapters, with commentary paragraph by paragraph, and appendix of additamenta; and the edition undertaken by Mario Krammer for the Mon.
The hills on the right bank Geology, of the Tiber culminating in Monte Mario (455 ft.) belong to the first of these, being of the Pliocene formation; they consist of a lower bluish-grey clay and an upper group of yellow sands and gravels.
This clay since Roman times has supplied the material for brick-making, and the valleys which now separate the different summits (Janiculum, Vatican, Monte Mario) are in considerable measure artificial.