> If you use a spell that you has to learn via research (such as "Weather
> Symbols") do you have to research the spell again to learn it again? or
can
> you just study it?
With very few exceptions, (i.e. Transcend Death) you do not forget a spell
when you use it. In those few exceptions, you only need to "study" it to
relearn it.
You never have to research a spell again once it has been successfully
researched.
To the best of my knowledge,
Pat