YIELD TABLES 85 
Look in Yield Table II, column a, for the amount 
nearest 6000 board feet. It is found in line 7. In 
twenty years there will be about 3320 feet per acre cut- 
ting down to twelve inches (Yield Table II, column g). 
What is wanted now is the corresponding cut down to 
ten inches. Look in Yield Table II, column a, for the 
amount nearest 3320. It is found to be about midway 
between the amounts given in lines 3 and 4. Now 
look for the corresponding point in the ten-inch table 
(Yield Table I, column a). Midway between lines 
3 and 4 gives the final answer, or about 4000 feet. 
EXAMPLE NO. 4 
A man owns 10,000 acres of Spruce land from which 
he obtained 1500 board feet per acre ten inches and 
over in diameter ten years ago. How soon can he cut 
the same amount? 
Look in Yield Table I, column a, for the amount 
nearest 1500 feet. Itis found in line 1. In this table, 
column /, twenty-seven years is given as the time to 
obtain about 1500 feet at the second cut. The land 
having been lumbered ten years ago, it will require 
seventeen years more for the required amount to grow. 
EXAMPLE NO. 5 
A man cut his Spruce land twenty years ago, getting 
2000 board feet per acre twelve inches and over in 
diameter. How much can he get now? 
