Pomponius (Pandect. l. i. tit. ii. leg. 2) observes, that of the three founders of the civil law, Mucius, Brutus, and Manilius, extant volumina, scripta Manilii monumenta; that of some old republican lawyers, haec versantur eorum scripta inter manus hominum. Eight of the Augustan sages were reduced to a compendium: of Cascellius, scripta non extant sed unus liber, etc.; of Trebatius, minus frequentatur; of Tubero, libri parum grati sunt. Many quotations in the Pandects are derived from books which Tribonian never saw; and in the long period from the viith to the xiiith century of Rome, the apparent reading of the moderns successively depends on the knowledge and veracity of their predecessors.