There are a few inconsistent hyphens, and these have been left as printed.
In the list of the books in series "CHATS ON OLD MINIATURES. By J. J. Foster, F.S A" has been changed to "F.S.A."
p83. "like one round" changed to "found."
The illustration and it's companion blank page (p243 and 244) appear between p241 and 242 in the Internet Archive scan from which this text has been derived. It has been moved to the correct place.
p287. A single occurrence of cloissonÉ has been changed to cloissonnÉ, the spelling found in the rest of the text.
p397. (Index) "Boadicea, Queen, 99–91" changed to "Boadicea, Queen, 91."