THE ECONOMIC IMPORTANCE OF FORESTS 507 



4. Forest reserves held by the Government. 



5. Forest rangers to protect reserves. 



6. Forestry schools, to instruct people. 



Timber Structure. 



1. Grain, due to annual rings, bastard and rift, due to pith rays, 



quarter and plain. 



2. Heart and sap wood. 



3. Shrinkage and warping. 



4. Hard and soft woods. 



5. Knots. 



Street Trees. 



1. Value. 



2. Most useful kinds. 



3. Means of protection. 



