M. D'Anville has given, in the Memoirs of the
Academy for the year 1756, (tom. xxx. p. 198 - 236,) a plan
of Rome on a smaller scale, but far more accurate than that
which he had delineated in 1738 for Rollin's history.
Experience had improved his knowledge and instead of Rossi's
topography, he used the new and excellent map of Nolli.
Pliny's old measure of thirteen must be reduced to eight
miles. It is easier to alter a text, than to remove hills or
buildings.