50 PRACTICAL FORESTRY 
ence of mankind. Besides yielding food and ma- 
terials for house construction, just in those places 
where fresh-water is the poorest and scarcest, the 
green nuts yield a cool, refreshing, and nutritious 
beverage. 
A MANGROVE SWAMP ON THE COAST OF FLORIDA. 
The process of land and soil formation through 
the aid of trees and forests is by no means confined 
to southern countries and southern forests. The wil- 
low, that Cinderella of trees, clothes with abundant 
green, low marshy places in northern districts, and in 
addition to holding the soil, yields pliant twigs which 
