USE OF THE FOREST 



171 



the logs and find that these trees furnish each about 0.88 

 of a cord of firewood. When trees are very branchy, as 

 in our old hardwood forests, the number of logs is usually 



FIG. 62. Calipers for measur- 

 ing the Diameter of Trees 



FIG. 63. Measuring the Height of a Tree 



small, and the amount of firewood commonly more than 

 half of all the timber. In pine, spruce, etc., the reverse 

 is true ; here the logs often make over seventy-five per 

 cent of all the wood in the tree. 



