Steve - you may not be so far off. There is a lot of iron in blood and iron could reasonably be expected to be picked up by a tree. And that could to the trick.

The red walnut on my property was growing along the river and was, in fact, undercut by the river. To say that it was a bottomland tree is an understatement. No cow pee or pig blood there.

Brent


_________
BrentD, (Professor - just for Stan)
=>/

[Linked Image from i.imgur.com]