The north and south streets varied, some observing that distance, others being no more than 260 ft.apart.As a result, the rectangular house-blocks varied also in size.

The largest seem to be those which fronted a street that crossed the town from east to west, from the Imperial Palace to the Baths and the West Gate, and corresponds roughly with the present Kaiserstrasse.

This may well have been the _decumanus_, the main east and west street of the 'colonia', and hence the house-blocks fronting it may have been unusually large (p.

77).

One of them, near the Neumarkt, reached the awkward size of nearly 3-1/2 acres (320 x 460 ft.).