SPECIAL KINDS OF FORESTS 187 



as a small tree, when it can be sold at good prices for 

 railway ties and piling. The same is true of chestnut. 

 In addition, it would be better in most cases to introduce 



FIG. 68. Old-Fashioned Way of boiling Maple Sap 

 (After W. F. Fox) 



considerable pine or spruce, since much coniferous lumber 

 is used everywhere. To prevent the groves of oak from 

 becoming too open and grassy, it would be well to mix 

 in some beech and maple wherever this trouble appears. 



