The following paper was originally read to the British Academy in 1905, and published in the second Volume of its Proceedings (pp.

185-217) and in a separate form (London, Frowde).

The latter has been sometime out of print, and, as there was apparently some demand for a reprint, the Delegates of the Press have consented to issue a revised and enlarged edition.

I have added considerably to both text and illustrations and corrected where it seemed necessary, and I have endeavoured so to word the matter that the text, though not the footnotes, can be read by any one who is interested in the subject, without any special knowledge of Latin.
F.HAVERFIELD.
OXFORD, April 22, 1912 CONTENTS.