I was taught that printers, back in Colonial days, thought that
periods and commas looked "lonely" if outside the quotation marks, so
they began putting them inside for aesthetic reasons.

My information is that in the old days, the thin periods and commas were
more delicate, and lasted longer if they were protected by the larger
quotes and parens. This is no longer an issue, and I stick with logic.

Jose
--
The monkey turns the crank and thinks he's making the music.
for Email, make the obvious change in the address.