The other class is called endogenous, and increases by layers applied to the inside; and when the hollow there is full, the growth is stopped--the tree must die.
Any injury is felt most severely by the first class on the bark; by the second on the inside; while the inside of the exogenous may be removed, and the outside of the endogenous may be cut, without stopping the growth in the least.

The mowana possesses the powers of both.

The reason is that each of the laminae possesses its own independent vitality; in fact, the baobab is rather a gigantic bulb run up to seed than a tree.
Each of eighty-four concentric rings had, in the case mentioned, grown an inch after the tree had been blown over.

The roots, which may often be observed extending along the surface of the ground forty or fifty yards from the trunk, also retain their vitality after the tree is laid low; and the Portuguese now know that the best way to treat them is to let them alone, for they occupy much more room when cut down than when growing.
The wood is so spongy and soft that an axe can be struck in so far with a good blow that there is great difficulty in pulling it out again.
In the dead mowana mentioned the concentric rings were well seen.

The average for a foot at three different places was eighty-one and a half of these rings.