Mary Ellin,  don't know why you were afraid to explain your study.  It
sounds fascinating.  I'm glad you elaborated a bit.  It helps people like 
me -  who carry unreferenced "knowledge" around in the back of our brains-
know that our accepted wisdom is not neccessarily fact.  Thanks.  Hope you
report back to the list, when you finish your work.
Linda Derry [log in to unmask]