The Bark of Trees.~--Did you ever peel the bark off of a young tree?
If so, you have noticed that there were really two barks, an outer bark, as thin as paper, through which you could almost see, and an inner and much thicker bark, which lay next to the wood of the tree.

You can peel the outer bark off without doing the tree much harm.

Indeed, if you will notice some of the fruit or shade trees in the yard, at home, you will see that the outer bark of the tree peels itself off, a little at a time, and that new bark grows in its place.

If you tear off the inner bark, however, it will injure the tree.

It will make it bleed, or cause the sap to run.