The houses of Italy and of the south generally were constructed to look inwards upon open _impluvia_, colonnaded courts and garden plots, and, as befitted a hot climate, they had few outer windows.

Moreover, they could be easily built side by side so as to form, as at Pompeii, the continuous streets of a town.

The houses of Britain and northern Gaul looked outwards on to the surrounding country.

Their rooms were generally arranged in straight rows along a corridor or cloister.

Sometimes they had only one row of rooms (Corridor House, Fig.