46 TREES AND TREE-PLANTING. 
when it shall then be examined, it will be found that by 
the aid of its internal heat the bud has thawed itself 
through the frozen soil to the surface of the ground. 
These facts show the immense power in plants to gener- 
ate heat, and the more trees there are on a property the 
warmer a locality becomes. Evergreens, besides pos- 
sessing this heat-dispensing property, have the additional 
property of keeping in check cold winds from other quar- 
ters, thus filling as it were, the twofold office of stove and 
blanket.” 
