42 BULLETIN 55, TJ. S. DEPARTMENT OF AGRICULTURE. 
Table 23. — Volume growth, in cubic feet, of balsam fir in Maine, on the basis of age. 
Age (years). 
Volume. 
Growth in 
volume 
every 5 
years. 
Annual 
growth in 
volume 
within 5- 
year period. 
65 
8. 81 
10. 64 
12. 55 
14. 50 
16. 51 
18. 60 
20.73 
22. 90 
70 
1.83 
1.91 
1.95 
2. 01 
2. 09 
2. 13 
2.17 
0. 366 
.382 
.390 
.402 
.418 
.426 
.434 
75 
80 
85 
90 
95 
100 
TAPER. 
Tables 24 to 29 show the taper of balsam fir in different situations 
in New York and Maine, expressed in inches and in per cent of the 
diameter breast high. The diameter breast high inside bark is taken 
as 100, and the diameters inside bark at 10, 20, 30, etc., feet from 
the ground expressed as fractions. 
These taper tables furnish a basis for the construction of volume 
tables in any log scale or in cubic measure, and serve in general to 
indicate the development of the bole under various conditions of 
growth. Thus, they show the more spindling development of balsam 
fir in the swamp than on either the flat or hardwood slope, and the 
better development, on the whole, in Maine than in New York. 
Table 24. — Taper of balsam fir in New York on swamp. 
[Expressed in per cent of the diameter inside "bark breast high.] 
Diameter breast high (inches). 
Height above ground (feet). 
4.5 
10 
20 
30 
40 
50 
60 
2 
20-foot trees. 
100 
100 
100 
72.2 
74.1 
70.3 
3 
4 
2 
30-foot trees. 
100 
100 
100 
100 
100 
100 
84.2 
85.7 
86.5 
89.1 
87.5 
89.2 
52.6 
57.1 
56.8 
58.7 
58.9 
60.0 
3 
4 
5 
6 
7 
40-foot trees. 
100 
100 
100 
100 
100 
100 
100 
100 
89.5 
89.3 
91.9 
91.5 
91.1 
92.3 
92.0 
91.8 
68.4 
71.4 
73.0 
72.3 
73.2 
75.4 
74.7 
72.9 
42.1 
42.9 
43.2 
44.7 
46.4 
46.2 
46.7 
47.1 
3 
4 
5 
6 
7 
8 
9 
1 
