THE YIELD OF A FOREST. 



17 



standing- to mature. That time is found b}^ studying 

 the rate of growth in diameter. 



This method of determinino- the yield by area is much 

 the most practic'a))le of the three for the forests of the 

 United States, and in general it is the sim])lest and 

 most widel}^ useful of all, because it does away with the 



Fig. 9.— a forest from which more than the yield is being taken. Big Trees in 

 the Sierra Nevada Mountains, California. 



difficult task of determinino- the yearly increase in 

 wood. 



The objects in handling forests are so yarious that 

 sometimes no single one of these methods is satisfac- 

 tory, and then combinations of them are of great use. 



