For it is a fact that the roots of a tree mirror the spreading crown of its branches. As the branches spread out, so do the roots in proportion. If the tree's branches die back, the roots do too. As above, so below. In this respect the system of the tree as a whole rather resembles, at top and bottom, the magnetic field of a bar magnet, or indeed of the Earth itself. And who knows what force fields, as yet unmeasured by man, may surround the physical manifestation of a tree?