It has been said, that Cæsar also made a collection of apophthegms and anecdotes, in the style of our modern _Ana_; but Augustus prevented these from being made public. That emperor likewise, in a letter to Pompeius Macrus, to whom he had given the charge of arranging his library, prohibited the publication of several poetical effusions of Cæsar’s youth. These are said to have consisted of a tragedy on the subject of Œdipus, and a poem in praise of Hercules(213). Another poem, entitled _Iter_ was written by him in maturer age. It is said, by Suetonius, to have been composed when he reached Farther Spain, on the twenty-fourth day after his departure from Rome(214); and it may therefore be conjectured to have been a poetical relation of the incidents which occurred during that journey, embellished, perhaps, with descriptions of the most striking scenery through which he passed. Two epigrams, which are still extant, have also been frequently attributed to him; one on the dramatic character of Terence, already quoted(215), and another on a Thracian boy, who, while playing on the ice, fell into the river Hebrus,— “Thrax puer, astricto glacie dum luderet Hebro,” &c. But this last is, with more probability, supposed by many to have been the production of Cæsar Germanicus. There were also several useful and important works accomplished under the eye and direction of Cæsar, such as the graphic survey of the whole Roman empire. Extensive as their conquests had been, the Romans hitherto had done almost nothing for geography, considered as a science. Their knowledge was confined to the countries they had subdued, and them they regarded only with a view to the levies they could furnish, and the taxations they could endure. Cæsar was the first who formed more exalted plans. Æthicus, a writer of the fourth century, informs us, in the preface to his _Cosmographia_, that this great man obtained a _senatusconsultum_, by which a geometrical survey and measurement of the whole Roman empire was enjoined to three geometers. Xenodoxus was charged with the eastern, Polycletus with the southern, and Theodotus with the northern provinces. Their scientific labour was immediately commenced, but was not completed till more than thirty years after the death of him with whom the undertaking had originated. The information which Cæsar had received from the astronomer Sosigenes in Egypt, enabled him to alter and amend the Roman calendar. It would be foreign from my purpose to enter into an examination of this system of the Julian year, but the computation he adopted has been explained, as is well known, by Scaliger and Gassendi(216); and it has been since maintained, with little farther alteration than that introduced by Pope Gregory XIII. When we consider the imperfection of all mathematical instruments in the time of Cæsar, and the total want of telescopes, we cannot but view with admiration, not unmixed