84 THE ADIRONDACK SPRUCE 
If the diameter limit is twelve inches, the average 
stand per acre is 1000 board feet. (See example.) The 
total stand is 1000<1000—1,000,000 board feet ; the 
same cut can be obtained in sixteen years (Yield Table 
II, column 7). 
If the diameter limit is fourteen inches the average 
stand per acre is about 750 board feet (Yield Table III, 
column a ); the total stand is 10007 50=7 50,000 board 
feet ; the same cut can be obtained in fifteen years 
(Yield Table III, column 7). 
If ten inches is the limit, the tract will yield at pres- 
ent 1,500,000 board feet, and in twenty-seven years the 
same amount again, or together 3,000,000 board feet. 
If twelve inches is the limit, 1,000,000 board feet can 
be cut now, and the same amount every sixteen years, 
making a total in thirty-two years of 3,000,000 board 
feet. If fourteen inches is the limit, 750,000 board feet 
can be obtained now, and an equal amount in fifteen, 
and again in thirty years, or altogether 2,250,000 board 
feet. 
It will therefore be most profitable to cut to ten 
inches. Aside from the question of profit, it would be 
better for the forest to cut to twelve rather than to ten 
inches. 
EXAMPLE NO. 3 
A man owns 20,000 acres of Spruce land from which 
he has cut 6000 board feet per acre twelve inches and 
over in diameter. How much can he obtain in twenty 
years if at that time he cuts to ten inches ? 
