3-i BULLETIN 55, TT. S. DEPAETMEXT OE AGKECTTLTTTRE. 
Table 10. — Average growth of balsam fir in Xevr Yori, on the basis of age, on f 
and hardwood slope. 
5 
5 
9 
4 
O-S 
3 
0. 6 
9 
3 
0.8 
20 
14 
5 
1.0 
ri 
^ 
.8 
14 
** 
1-0 
19 
5 
1-0 
la 
■* 
.8 
19 
9 
1.0 
23 
4 
.8 
19 
4 
-8 
24 
5 
1.0 
35 
27 
4 
.8 
4 
.8 
30 
g 
1 2 
40 
31 
4 
27 
4 
Is 
35 
5 
i'o 
45 
35 
4 
.8 
30 
3 
.6 
39 
4 
.8 
50 
38 
3 
.6 
32 
2 
.4 
43 
4 
.5 
55 
41 
3 
.6 
34 
2 
.4 
47 
4 
.8 
60 
43 
2 
.4 
36 
2 
.4 
49 
2 
.4 
65 
45 
2 
.4 
38 
2 
-4 
52 
3 
.6 
70 
47 
2 
.4 
40 
2 
.4 
54 
2 
.4 
to 
49 
2 
.4 
41 
1 
.2 
56 
2 
-4 
80 
51 
2 
.4 
43 
2 
.4 
57 
1 
.2 
85 _ 
52 
1 
_ 2 
44 
1 
.2 
58 
1 
-2 
90 
53 
1 
2 
.4 
59 
1 
.2 
95 
54 
1 
1 
.2 
60 
1 
.2 
100 
55 
1 
1 
.2 
61 
1 
.2 
105 
56 
1 
1 
.2 
61 

.0 
110 
57 
1 
1 
.2 
62 
1 
.2 
115 
58 
1 
1 
.2 
62 

.0 
130 
59 
1 
12 
52 
1 
.2 
63 
1 
.2 
125 
59 

.0 
52 

.0 
63 

.0 
130 
60 
1 
.2 
53 
1 
.2 
63 

.0 
135 
60 

.0 
53 

.0 
63 

.0 
140 
61 
1 
.2 
54 
1 
.2 
63 

.0 
145 
62 

-0 
64 
1 
_ 2 
150 
In Xew York balsam fir grows in height- at an average rate for all 
types of OA of a foot a year. 
On flats the growth between the ages of 20 and 45 is nearly 1 foot 
a year. At 60 years the current, annual growth equals the average 
annual growth, namely OA foot, which indicates that at this age the 
annual growth begins to decline. At the age of So the current an- 
nual growth is only 0.2 0: a foot, and at 125 years has practically 
In the swamp the growth in general is slower and on the hardwood 
slope faster than on the flat, but on the whole it culminates and begins 
to decline at about the same age in all three types. 
In Maine (Table 11) the average tree grows faster than in Xew 
York : namely, at the rate of 0.7 of a foot a year. The period of most- 
rapid growth is longer from the twentieth to the fiftieth year and the 
total height is greater. 
