324 
The Philippine Journal of Science 
1917 
Table IV . — Annual diameter growth of Podocarpus imb7'icatus at top of 
Mount Banahao, Luzon, P. I. — Altitude, about 2,100 meters — Continued. 
Diameter class in centimeters. 
No. of tree in class. 
30-40. 
40-50. 
BO-60. 
Diam- 
eter. 
Growth. 
Diam- 
eter. 
Growth. 
Diam- 
eter. 
Growth. 
1 
30.6 
0.09 
41.0 
0.13 
60.9 
0. 82 
2 
30.6 
0. 06 
61.9 
0. 13 
3 
32.0 
0.22 
63.1 
0. 16 
4 
32.1 
0.09 
56.1 
0.25 
5 
33.0 
0. 16 
6 
33.2 
0.3B 
7 
33.4 
0.19 
8 
33.8 
0.22 
9 
34.8 
0.03 
10 
36.0 
0.16 
11 
12__ 
13 
14 
15.. 
16 
17 
18 
19 
20 
21 
22 
23 
24 . 
26 
26.... 
1 
27 
28 
29... 
30 
0. 16 
0. 13 
0.21 
Years in class 
62 
77 
53 
This curve is shown in fig. 1. The curve indicates that the 
trees undergo a suppression period before they reach diameters 
of 10 centimeters. According to this curve a tree 60 centimeters 
in diameter has an age of 497 years. 
The method used in estimating the age of Podocarpus is open 
to the following objections. All of the trees in the 0- to 10- 
centimeter diameter class were more than 5 centimeters in diam- 
eter, and it is to be expected that they would show a faster 
rate of growth than smaller and more suppressed individuals. 
On the other hand some of the trees in the 0- to 10-centimeter 
diameter classes may be shaded to such an extent that they 
will die before reaching larger sized diameter classes. Such 
