PREDICTION OF FUTURE YIELDS. 65 
If, on the other hand, 12 inches is made the minimum limit for cut- 
ting, the first cut will be 2,490 board feet, which amount can again be 
obtained in 24 years. (See Table B, page 43.) In the first case 
the growth of merchantable timber is 83 board feet, in the second 164 
board feet per acre per aunum. The land will, therefore, produce more 
timber in the long run if the trees under 12 inches in diameter are left 
standing than if only those under 10 inches remain. In the case of 
Nehasane Park and the Whitney Preserve, however, the owners wish 
to obtain the greatest possible immediate return without seriously 
impairing the productive power of the forest, and are willing to wait 
a longer period for a second cut. It is recommended, therefore, that 10 
inches be made the minimum limit for cutting Spruce. The prediction 
of the future yield on the two tracts can be made by reference to the 
yield tables on pages 47 and 48, as is Shown in the following paragraphs: 
PREDICTION OF FUTURE YIELD IN NEHASANE PARK. 
On page 74 the exact amount of Spruce cut during the season 1898-99 
is shown to be 13.15 standards per acre, or 2,630 board feet per acre, if 
one standard log contains 200 board feet, as is usually estimated in the 
Adirondacks. This yield is smaller than the estimate given for the 
average staud per acre over the whole park in “The Adirondack 
Spruce.” The small yield is explained by the fact that a larger propor- 
tion of swamp land occurs on the section cut over than elsewhere; that 
a wide strip along the railroad bad been cut over for ties; that there is a 
large windfall area on which no merchantable timber at allstood; thata 
considerable number of trees were left for seed, because they contained 
only one log or were not readily accessible, and that the lumbermen 
wasted a certain amount of Spruce in building skidways. In the por- 
tion of the park lumbered during the past season 217 acres were sur- 
veyed by the writer in 1897 and found to average 2,584 board feet per 
acre, or Slightly below the actual amount cut. 
Iu view of the fact that there is a large amount of promising young 
Spruce on the windfall area, as well as on the tract lumbered for ties, 
and that many patches of trees and individuals in swamps and inac- 
cessible places were left standing by the lumbermen, it is fair to base 
the computation of future yield on a present stand of at least 3,000 
board feet per acre. 
Inasmuch as the timber is cut to a minimum limit of 10 inches, Table 
A, page 47, should be used in the calculation of future crops. On areas 
with an average stand of 3,000 board feet there can be cut in 10 years 
11 per cent of the original stand, or 330 board feet; in 20 years, 41 per 
per cent, or 1,230 board feet; in 30 years, 70 per cent, or 2,100 board 
feet; and the original amount—namely, 3,000 board feet—can be 
obtained in 36 years. 
4364—No, 26 ——5 
