Yet both bear to-day the stamp of the Middle Ages, and the Roman streets which they use are small and nearly unrecognizable fragments.
There is, indeed, no law of survivals.

Chance--that convenient ancient word to denote the interaction of many imponderable forces--has ruled one way in one place and otherwise in another.

Sometimes monuments have alone survived, sometimes only streets, and we can seldom give reasons for this contrast of fates.

At Pola, gates, temples, and amphitheatre still tell of the Roman past and the modern town-square keeps so plainly the tradition of the Forum that you cannot walk across it without a sense of what it was.

Yet not a single street agrees with those of the Roman 'colonia'.