More often mediaeval and modern streets seem to follow ancient lines and the ancient town-plan, or a part of it, survives in use to-day.

Such survivals are especially common in the north of Italy.

It is not, indeed, possible to gather a full list of them.

He who would do that needs a longer series of good town-maps and good local histories than exist at present; he needs, too, a wider knowledge of mediaeval Italian history and a closer personal acquaintance with modern Italian towns, than a classical scholar can attempt.

But much can be learnt even from our limited material.[68] [68] See the seventeenth century Atlases of Blaeu, Janssons, and others, the modern maps prepared by Grassellini and others about 1840-50 (some on the scale 1:4,000), and in particular the _Atlante geografico_ of Attilio Zuccagni-Orlandini (Firenze, 1844), and the recent town-maps of various Italian cities (mostly about 1:10,500).