Another smaller enclosure lies to the east with a gateway also of the Roman period.
If, therefore, the walls of the enclosure held the gas that is directly in contact with them, this equilibrium would be the actual state of affairs; and it would follow from the principle of Archimedes that, when extraneous forces such as gravity are not considered, the gas would exert no resultant force on any body immersed in it.
Of Fareham, on Portsmouth harbour, are the interesting ruins of Porchester Castle, an extensive walled enclosure retaining its Norman keep, and exhibiting in its outer walls considerable evidence of Roman workmanship; Professor Haverfield, however, denies that it occupies the site of the Roman Portus Magnus.
The walls of the Acropolis are in of thin slabs of stone set up on end, with others laid across the top of them; at the part of this enclosure nearest to the Lion Gate is an entrance.
The brick enclosure wall of the temple is still plainly visible near the little village of Sa el hagar (Sa of stone) on the east bank of the Rosetta branch, but the royal tombs and other monuments of Sais, some of which were described by Herodotus, and its inscribed records, have all gone.