Could you explain how inner bark and then how outer bark is formed on
trees?

Yes. Could you?

John, don't get your feathers so ruffled...if your going to blatantly market
yourself on Usenet constantly (rec.gardens, alt.forestry), I would argue
that you owe it to the other members to add more to the dialog than merely
the bi-weekly sales teaser. You sound like a smart guy, join the fray and
we'll become enriched..
Mike
--
Mike LaMana, MS, CTE
Consulting Forester & Arborist
Heartwood Consulting Services, LLC
Toms River, NJ
www.HeartwoodConsulting.net