82 THE ADIRONDACK SPRUCE 
EXAMPLE NO. I. 
A man owns 30,000 acres which yield on an average 
3500 board féet per acre of Spruce ten inches and over in 
diameter. To what limit will it be most profitable in the 
long run for him to cut, how much can he cut annually 
if he wishes to obtain a sustained annual yield, and 
how soon can he return to the portion cut over the first 
year and cut the same amount of timber above the 
same diameter limit as at first ? 
Look in Yield Table I, column a, for the amount 
nearest 3500 board feet. 3480 in line 3 is the closest 
figure. All the desired information will be obtained 
on this line in the three tables. 
If the diameter limit is ten inches, the total stand 
is 30,000 3500—105,000,000 board feet; the same yield 
can be obtained in thirty-seven years (Yield Table I, 
column /); the area lumbered annually will be 
30,000—37—811 acres; the annual cut will be 105,- 
000,000——37=2,837,838 board feet. 
If the diameter limit is twelve inches, the average 
stand per acre is about 3000 feet (Yield Table II, column 
a), the total stand is 30,000 3000— 90,000,000; the 
same yield can be obtained in twenty-five years (Yield 
Table II, column 7); the area lumbered annually will 
be 30,000—25—1200 acres; the annual cut will be 
90,000,000—2 5—= 3,600,000 board feet. 
If the diameter limit is fourteen inches, the average 
stand per acre is about 2000 board feet (Yield Table III, 
column a); the total stand is 30,000>%<2000— 60,000,000 
