of Scotland_, xxxviii.

454.] [Footnote 6: The town wall of Isurium, partly visible to-day in Mr.A.S.
Lawson's garden, is constructed in a fashion which suggests rather the second century than the later date when most of the town walls in Britain and Gaul were probably built, the end of the third or even the fourth century.

Thus, its stones show the 'diamond broaching' which occurs on the Vallum of Pius, and which must therefore have been in use during the second century.] Peace hardly set in till the opening of the third century.

It was then, I think, that country-houses and farms first became common in all parts of the civilized area.

The statistics of datable objects discovered in these buildings seem conclusive on this point.