This is a tree which has the peculiarity that its pale green leaves are
never still for a moment, but are always quivering and trembling. The
reason of this is a very sad one, and explains why the Aspen can never
be at rest. We are told that the Cross of Our Blessed Lord was made of
the wood of the Aspen, and that the poor tree was so terribly grieved to
be used for such a purpose that it has trembled ever since.