THE RED SPRUCE. 
31 
which gain positions in the main crown cover start at about the 
same time and develop with very little interruption. Their height 
and age may consequently he easily correlated. The following table 
shows the average height of the dominant and intermediate trees 
comprising even-aged second-growth spruce stands of different ages 
and on sites of different quality, measured in Maine, New Hampshire, 
and Vermont in the fall of 1910. 
Table 5. — Height groiuih of spruce in even-aged, old pasture stands in Maine, New 
Hampshire, and Vermont according to age and site qualities. 
[Average height of all dominant (including codominant) and intermediate trees in stands of different ages.] 
[CURVED.] 
Age. 
Site qualities. 
Basis. 
I. 
II. 
III. 
Years. 
20 
25 
30 
35 
40 
45 
50 
55 
60 
65 
70 
75 
80 
85 
90 
95 
100 
Feet. 
24 
31 
36 
42 
46 
51 
55 
58 
61 
64 
66 
68 
70 
72 
73 
74 
76 
Feet. 
19 
25 
31 
36 
40 
44 
47 
50 
53 
55 
57 
59 
61 
63 
64 
65 
66 
Feet. 
14 
20 
25 
30 
34 
37 
40 
42 
45 
47 
49 
50 
52 
53 
55 
56 
57 
Sample 
plots. 
1 
1 
1 
6 
6 
8 
16 
14 
4 
1 
1 
59 
From sample plot data collected in 1910. 
For purposes of comparison the growth in height of Norway spruce 
is given in Table 6. 
Table 6. — Height growth of Norway spruce. 1 
Average 
Age. 
height of 
stand. 
Years. 
Feet. 
5 
8 
10 
16 
15 
24 
20 
32 
25 
39 
30 
45 
35 
50 
40 
54 
45 
58 
50 
61 
55 
64 
60 
66 
1 Based on all measurements of all trees in 11 plantations (8 Quality I and 3 Quality II) 24-55 years old 
(cur ed), made by Messrs. Tillotson, Barrows, and Williamson, of the Forest Service, in 1911, in Rhode 
Island, Connecticut, Illinois, and Iowa. 
