THE PRODUCTION OF SPRUCE. A5 
THE PRODUCTION OF SPRUCE. 
In the study of the production of a forest it is necessary to know not 
only the rate of growth of the individual trees, but also how much 
young timber will be left standing after lumbering to form the basis 
for a second crop. An exhaustive study of this question was made in 
the investigation of the Spruce in Nehasane Park in 1897. In this 
connection 1,046 sample plots, of 1 acre each, were surveyed to deter- 
mine the number of trees per acre of different diameters. The results 
of these measurements are summarized in the table following. The 
surveys are grouped according as the yield per acre was, in round 
numbers, 1,000, 2,000, 3,000, etc., board feet. In each class the total 
number of acres involved is stated, and the average number of trees 
per acre. For the sake of accuracy, fractions of trees have been 
given. In the case of the large diameters there is less than one tree 
of each diameter per acre, and the result is often a very small fraction. 
Average number of trees per acre of different diameters, and number of acres measured, 
classified according to the yield in board feet of all trees 10 inches and over in diameter 
breast high. 
[From ‘‘The Adirondack Spruce.”’] 
Yield of all trees 10 inches and over in diameter breast high, in board feet. 
Sees 1,000 | 2,000 | 3,000 | 4,000 | 5,000 | 6,000 | 7,000 | 8,000 | 9,000 | 10,000} 11,000 | 12,000 
Tea (139 (213 (223 (204 (106 (71 (37 (21 (4 (5 (1 (2 
high acres).| acres). acres) .| acres)./acres).| acres).| acres). acres).|acres).| (acres.| acre). | acres). 
Average number of trees. 
| 
Inches. 
22.30 | 20.50 | 21.10 | 21.20 | 21.50 | 24.90 | 26.30 | 24.20 |. 23.50 | 23.00] 16.0] 49.0 
3 | 18.70 | 19.30 | 20.00 | 19.10 | 19.90 | 23.30 | 24.30 | 24.10 | 18.20 | 24.40 9.0} 41.0 
4 | 17.90 | 18.10 | 18.20 | 18.30 | 19.70 | 21.40 | 23.10 | 21.80 | 14.50 | 18.40 | 20.0] 34.0 
5 | 12.80 | 13.00 | 12.90 | 13.90 | 14.60 | 16.90 | 18.40 | 18.50 | 13.00 | 17.80 | 15.0} 23.5 
6 | 10.90 | 10.60 | 12.10 | 12.20 | 13.60 | 13.60 | 14.50 | 13.20 | 13.00 | 16.00 | 25.0) 17.5 
7| 8.70} 8.30} 9.20} 10.20 | 10.60 | 11.90 | 12.80 | 12.90 | 12.70 | 12.60] 17.0] 19.5 
8] 6.80} 7.40] 7.80} 8.20) 8.90) 9.70 | 10.60} 9.80] 11.00} 8.40] 20.0] 13.5 
9/ 5.30] 5.40) 6.50] 7.50] 7.30] 8.80] 10.30] 9.40] 7.20] 8.60; 10.0] 13.0 
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