CHAP. 86.—THE MARROW: ANIMALS WHICH HAVE NO MARROW.
The marrow seems also to be formed of a similar material;
in the young it is of a reddish colour, but it is white in the
aged. It is only found in those bones which are hollow, and
not in the tibiæ of horses or dogs; for which reason it is, that
when the tibia is broken, the bone will not reunite, a process
which is effected1
by the flow of the marrow. The marrow is
of a greasy nature in those animals which have fat, and suetty
in those with horns. It is full of nerves, and is found only in
the vertebral column2
in those animals which have no bones,
fishes, for instance. The bear has no marrow; and the
lion has a little only in some few bones of the thighs and
the brachia, which are of such extraordinary hardness that
sparks may be emitted therefrom, as though from a flint-stone.