Nor can we fix the number of the 'insulae'.

On the west, and still more on the east and south-east of the town, much of the area was not touched by the drainage works and therefore went unexplored.

We have proof only of streets and buildings for a mile in length and half a mile in breadth.
[Illustration: FIG.30.

TRIER.
From plan by the late Dr.Graeven.] Nevertheless we may make some guess at the original area.

The streetage itself plainly dates from the original foundation of the Romano-Gaulish town by Augustus.