Desert." It has a large barrel-shaped body which is covered with
long spikes that are curved like fishhooks. It is full of sap
that is sometimes used to quench thirst. By cutting off the top
and scooping out a hollow, the cup-shaped hole soon fills with a
sap that is not exactly nectar but can be drunk in an emergency.
Men who have been in danger of perishing from thirst on the
desert have sometimes been saved by this unique method of well
digging.

Greasewood, or creasote bush as it is sometimes called on account
of its pungent odor, grows freely on the desert, but has little
or no value and cattle will not touch it. Like many other desert
plants it is resinous and if thrown into the fire, the green
leaves spit and sputter while they burn like hot grease in a
frying pan.

The mesquite tree is peculiarly adapted to the desert and is the
most valuable tree that grows in the southwest. As found growing
on the dry mesas of Arizona, it is only a small bush, but on the
moist land of a river bottom it becomes a large forest tree. A
mesquite forest stands in the Santa Cruz valley south of Tucson
that is a fair sample of its growth under favorable conditions.

Its wood is hard and fine grained and polishes beautifully. It
is very durable and is valuable for lumber, fence posts and
firewood. On the dry mesas it seems to go mostly to root that is
out of all proportion to the size of the tree. The amount of
firewood that is sometimes obtained by digging up the root of a
small mesquite bush is astonishing.