>As is most often the case,
> no double-long vowels need be employed.
You're suggesting that Osthoff's law cannot be applied to long diphthongs,
since they did not exist?
Was there never a distinction between -o:i and -oi?
I've just looked through Collinge on Osthoff. He gives some good objections
to both long diphthongs and Osthoff's law. But Collinge gives objections to
everything, so I'd be interested in your opinion - or that of anyone else
listening.
Peter