Topsie beat me to it.

I was always under the impression that the rule wa sindeed as pointed out - Hence no stop after Mr , Mrs or Miss - The latter 2 being abreviations of Mistress btw.

Always wondered how it worked on abreviations with the last part missing but something else substituted - Dave instead of David springs to mind for some reason;-)

Or how about where both the begining and end are truncated? Scrip for prescription for instance. Should it be .scrip. ?

Cheers

Dave the Gnome