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TREATMENT OF THE FOREST 107 
the lumber operations would be much cheapened by 
cutting the entire tract in a short time, and the expense 
of extra rangers and expert superintendence would be 
saved from the time the lumbering was finished till the 
second cutting. 
The working-plan for Ne-Ha-Sa-Ne Park has been 
made on two assumptions—one that it will be desirable 
to insure a sustained annual yield, and the other that it 
will not. The former would be accomplished by cutting 
an approximately equal portion of the forest each 
year. The area lumbered yearly would then be equal 
to the total area divided by the number of years which 
must elapse before any one portion can be lumbered a 
second time. If, however, for any reason the owner of 
the Park should desire to cut the entire area as quickly 
as the means at hand would permit, the plan would in 
no essential way be changed, except that the tract must 
be left for the allotted period before the second cutting 
without yielding any more return. 
From the yield tables the period between equal cuts 
on the same area is determined to be twenty-five years, 
if, as is shown below, twelve inches is the minimum 
diameter to which Spruce should be cut in the Park. 
The yield per acre for the trees ten inches and over 
is 3703 board feet; the total stand is 101,954,699 
board feet ; the same cut can be obtained again in thirty- 
seven years (Yield Table I, column /, line 3); the area 
lumbered annually would be 27,533 37 =744 acres; 
the annual cut would be 101,954,699 — 37 =2,755,532 
board feet. 
