JOWA ACADEMY OF SCIENCES. 
89 
GROWTH OF YOUNG PINUS PONDEROSA ON BOULDER CREEK. 
Year. 
1904. 
1903. 
1902. 
1901. 
1900. 
1899. 
Inches 
7 
6 
4 
5 
4 
3 
Inches 
11 
12 
7 
4 
5 
3 
Inches 
10 
8 
10 
4 
6 
4 
Inches 
8 
7 
3 
6 
5 
4 
Inches 
6 
8 
6 
4 
5 
6 
Inches 
4 
3 
3 
4 
7 
5 4ft. H. 
Inches. 
6 
9 
5 
5 
4 
Inches 
10 
7 
7 
3 
3 
3 3 ft. H. 
Inches 
6 
7 
6 
4 
3 
2 
Inches 
6 
10 
8 
7 
7 
6 
Inches 
7 
10 
10 
10 
11 
1 8 10 ft. H 
Inches 
7 
6 
8 
7 
7 
1 7 4 ft. H 
During the first few years the annual growth in length 
is much less than when a young tree attains the height of 
eight or ten feet. The number and size of trees growing 
in an open forest on Boulder creek at an altitude of five 
thousand feet was as follows: 
THE DIAMETER AND HEIGHT OF PINUS PONDEROSA COMPARED 
WITH OTHER SPECIES. 
Species. 
Diameter 
in Inches 
Height 
in Feet. 
Pinus ponderosa 
24 
90 
Pinus ponderosa 
25 
90 
Pinus ponderosa 
28 
94 
Pinus ponderosa 
]6 
75 
Pinus ponderosa 
21 
75 
Pinus ponderosa 
22 
75 
Pinus ponderosa 
21 
70 
Pinus^ ponderosa 
21 
65 
Pinus ponderosa 
12 
50 
Pinus ponderosa 
6 
40 
Pseudotsuga douglasii 
8 
50 
Pseudotsuga douglasii 
12 
60 
Pseudotsuga douglasii 
18 
65 
Pseudotsuga douglasii 
6 
50 
Pseudotsuga douglasii 
4 
35 
Pseudotsuga douglasii 
4 
35 
Pinus murrayana 
11 
45 
Pinus murrayana 
10 . 
50 
Picea punp'ens 
6 
40 
Picea pungens 
4 
35 
