see the book through the
press. I must, therefore, assume entire responsibility for the
translation of the tenth book, beginning with chapter thirteen, and
further responsibility for necessary changes made by me in the earlier
part of the translation, changes which, in no case, affect any theory
held by Professor Morgan, but which involve mainly the adoption of
simpler forms of statement, or the correction of obvious oversights.

The text followed is that of Valentine Rose in his second edition
(Leipzig, 1899), and the variations from this text are, with a few
exceptions which are indicated in the footnotes, in the nature of a
return to the consensus of the manuscript readings.

The illustrations in the first six books are believed to be
substantially in accord with the wishes of Professor Morgan. The
suggestions for illustrations in the later books were incomplete, and
did not indicate, in all cases, with sufficient definiteness to allow
them to be executed, the changes from conventional plans and designs
intended by the translator. It has, therefore, been decided to include
in this part of the work only those illustrations which are known to
have had the full approval of Professor Morgan. The one exception to
this principle is the reproduction of a rough model of the Ram of
Hegetor, constructed by me on the basis of the measurements given by
Vitruvius and Athenaeus.

It does not seem to me necessary or even advisable to enter into a long
discussion as to the date of Vitruvius, which has been assigned to
various periods from the time of Augustus to the early centuries of our
era. Professor Morgan, in several articles in the _Harvard Studies in
Classical Philology_, and in the _Proceedings of the American Academy_,
all of which have been reprinted in a volume of _Addresses and Essays_
(New York, 1909), upheld the now generally accepted view that Vitruvius
wrote in the time of Augustus, and furnished conclusive evidence that
nothing in his language is inconsistent with this view. In revising the
translation, I met with one bit of evidence for a date before the end of
the reign of Nero which I have never seen adduced. In viii, 3, 21, the
kingdom of Cottius is mentioned, the name depending, it is true, on an
emendation, but one which has been universally accepted since it was
first proposed in 1513. The kingdom of Cottius was made into a Roman
province by Nero (cf. Suetonius, _Nero_, 18), and it is inconceivable
that a