SUNLIGHT FACTORIES 
57 
and the smaller ones divide and redivide. All 
of the smaller ones are covered with root hairs. 
Just as with the smaller plants, it is the root hairs 
that do the real work of absorbing moisture 
from the soil. 
When a tree is dug up, or a tree in the woods 
has been blown over, it is easy to see what a 
twisted network of branches there is under 
ground. The root hairs are plainly seen. It is 
interesting to think how important these tiny 
fibers are to the life of a big tree. 
A tree's roots 
must reach far 
in the ground 
