16 TREES AND TREE-PLANTING. 
’ along the highways at the public expense. Railways 
should be compelled to plant trees along the whole 
_ length of their track on either side, and preserve them 
’ from fires. Reservations should be laid off around the 
heads of rivers and streams, and no timber be allowed 
to be cut there. It is true that we cannot in one or 
even two generations repair all the damage that has al- 
ready been done; but, by beginning at once, we may 
yet avoid the terrible scourge of a timber famine in the 
United States. 
