YIELD TABLES 83 
_ board feet; the same yield can be obtained in twenty 
years (Yield Table III, column 7); the area lumbered 
annually will be 30,000—20—1500 acres; the annual 
cut will be 60,000,o00—20— 3,000,000. 
By comparing these results it appears that it will be 
most profitable to cut to twelve inches, since the an- 
nual cut is then largest. The area lumbered annually 
is about four hundred acres greater than if ten inches 
were the limit, but the annual cut is about 800,000 
board feet larger. Lumbering under these conditions 
would nevertheless be profitable, inasmuch as the aver- 
age stand per acre for trees twelve inches and over in 
diameter is about 3000 board feet. 
EXAMPLE NO. 2 
A man owns 1000 acres yielding 1000 board feet per 
acre of Spruce twelve inches and over in diameter. To 
what limit will it be most profitable in the long run to 
cut, if he lumbers the entire tract in one year, and how 
soon can he return for a second cut equal to the 
first ? 
Look in Yield Table II, column a, for the amount 
nearest 1000 board feet. The closest figure is 1073 
feet, in line 1. All the desired information will be ob- 
tained on this line in the three tables. 
If the diameter limit is ten inches, the average stand 
per acre is, in round numbers, 1500 board feet (Yield 
Table I, column a) ; the total stand is 10001500— 
1,500,000 board feet; the same cut can be obtained 
in twenty-seven years (Yield Table I, column 7). 
