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 42 over Western Asia and Egypt. By the time of Ptolemy the empire was thorougly consolidated, and his map and geographical notices are only tolerably accurate within the confines of the empire.

One of the means by which the Romans were enabled to consolidate their dominion must be here shortly referred to. In order that their legions might easily pass from one portion of this huge empire to another, they built roads, generally in straight lines, and so solidly constructed that in many places throughout Europe they can be traced even to the present day, after the lapse of fifteen hundred years. Owing to them, in a large measure, Rome was enabled to preserve its empire intact for nearly five hundred years, and even to this day one can trace a difference in the civilization of those countries over which Rome once ruled, except where the devastating influence of Islam has passed like a sponge over the old Roman provinces. Civilisation, or the art of living together in society, is practically the result of Roman law, and in this sense all roads in history lead to Rome.

The work of Claudius Ptolemy sums up to us the knowledge that the Romans had gained by their inheritance, on the western side, of the Carthaginian empire, and, on the eastern, of the remains of Alexander's empire, to which must be added the conquests of Cæsar in North-West Europe. Cæsar is, indeed, the connecting link between the two shells that had been growing throughout ancient history. He added Gaul, Germany, and Britain to geographical knowledge, and, by his struggle with Pompey, connected the Levant with his northerly conquests. One result