From what has been above said of Fabius Pictor, and his immediate successors, it must be apparent, that the art of historic composition at Rome was in the lowest state, and that Sallust had no model to imitate among the writers of his own country. He therefore naturally recurred to the productions of the Greek historians. The native exuberance, and loquacious familiarity of Herodotus, were not adapted to his taste; and simplicity, such as that of Xenophon, is, of all things, the most difficult to attain: He therefore chiefly emulated Thucydides, and attempted to transplant into his own language the vigour and conciseness of the Greek historian; but the strict imitation, with which he has followed him, has gone far to lessen the effect of his own original genius. The first book of Sallust was the _Conspiracy of Catiline_. There exists, however, some doubt as to the precise period of its composition. The general opinion is, that it was written immediately after the author went out of office as Tribune of the People, that is, in the year 703: And the composition of the _Jugurthine War_, as well as of his general history, are fixed by Le Clerc between that period and his appointment to the Prætorship of Numidia. But others have supposed that they were all written during the space which intervened between his return from Numidia, in 708, and his death, which happened in 718, four years previous to the battle of Actium. It is maintained by the supporters of this last idea, that he was too much engaged in political tumults previous to his administration of Numidia, to have leisure for such important compositions—that, in the introduction to Catiline’s Conspiracy, he talks of himself as withdrawn from public affairs, and refutes accusations of his voluptuous life, which were only applicable to this period; and that, while instituting the comparison between Cæsar and Cato, he speaks of the existence and competition of these celebrated opponents as things that had passed over—“Sed mea memoria, ingenti virtute, diversis moribus, fuere viri duo, Marcus Cato et Caius Cæsar.” On this passage, too, Gibbon in particular argues, that such a flatterer and party tool as Sallust would not, during the life of Cæsar, have put Cato so much on a level with him in the comparison instituted between them. De Brosses agrees with Le Clerc in thinking that the Conspiracy of Catiline at least must have been written immediately after 703, as Sallust would not, subsequently to his marriage with Terentia, have commemorated the disgrace of her sister, for she, it seems, was the vestal virgin whose intrigue with Catiline is recorded by our historian. But whatever may be the fact as to Catiline’s Conspiracy, it is quite clear that the Jugurthine War was written subsequent to the author’s residence in Numidia, which evidently suggested to him this theme, and afforded him the means of collecting the information necessary for completing his work.