Ok Pat I have to ask, what changes take place in that growth ring over the course of the trees dormancy that change it from 'immature' to 'mature' and how do they relate to/improve its use as a bow wood's back? Is it's resistance to tension forces improved?
So, if a tree was cut at the end of the growing season, with the ring full thickness, and the bark slipped off, the summer ring below it, 2nd one down, that has had a dormant season to 'mature', is better for use as the bow's back?