Mr. Hume is justly surprised at a passage in Herodian (1. iv. p. 139), who, on this occasion, represents the Imperial palace as equal in extent to the rest of Rome. The whole region of the Palatine Mount on which it was built, occupied, at most, a circumference of eleven or twelve thousand feet (Notitia and Victor, in Nardini's Roma Antica). But we should recollect that the opulent senators had almost surrounded the city with their extensive gardens and suburban palaces, the greatest part of which had been gradually confiscated by the emperors. If Geta resided in the gardens that bore his name in the Janiculum; and if Caracalla inhabited the gardens of Maecenas on the Esquiline, the rival brothers were separated from each other by the distance of several miles; and yet the intermediate space was filled by the imperial gardens of Sallust, of Lucullus, of Agrippas of Domitian, of Caius, etc., all skirting round the city, and all connected with each other, and with the palace, by bridges thrown over the Tiber and the streets. But this explanation of Herodian would require, though it ill deserves, a particular dissertation, illustrated by a map of ancient Rome.