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Rh of posts. Houses were everywhere erected at the distance only of five or six miles; each of them was constantly provided with forty horses, and, by the help of these relays, it was easy to travel an hundred miles in a day along the Roman roads. The use of the posts was allowed to those who claimed it by an Imperial mandate; but, though originally intended for the public service, it was sometimes indulged to the business or conveniency of private citizens. Nor was the communication of the Roman Navigation empire less free and open by sea than it was by land. The provinces surrounded and enclosed the Mediterranean; and Italy, in the shape of an immense promontory, advanced into the midst of that great lake. The coasts of Italy are, in general, destitute of safe harbours; but human industry had corrected the deficiencies of nature; and the artificial port of Ostia, in particular, situate at the mouth of the Tiber, and formed by the Emperor Claudius, was an useful monument of Roman greatness. From this port, which was only sixteen miles from the capital, a favourable breeze frequently carried vessels in seven days to the columns of Hercules, and in nine or ten to Alexandria in Egypt.

Whatever evils either reason or declamation have imputed improvement to extensive empire, the power of Rome was attended with some beneficial consequences to mankind; and the same freedom of intercourse which extended the vices, diffused likewise the improvements, of social life. In the more remote ages of antiquity, the world was unequally divided. The east was in the immemorial possession of arts and luxury; whilst the west was inhabited by rude and warlike barbarians, who either disdained agriculture, or to whom it was totally unknown. Under the protection of an established government, the productions of happier climates and the industry of more civilized nations were gradually introduced into the western countries of Europe;