xn, c, 6 Brotmi: Mount Ba}iahao’s Podocarpus Imbricatus 323 
size class from 0 to 10 centimeters into 10 centimeters may be 
assumed to be the age of a 10-centimeter tree. Adding this 
quotient to that obtained in a similar manner for the 10- to 20- 
centimeter class, gives the age of a 20-centimeter tree. In order 
to obtain figures for the age of trees of any size and to represent 
the above data in graphic form, a curve of diameter growth on 
age was constructed by plotting the data on cross-section papers, 
the ordinates of the curve being diameters and the abscissae, 
years. 
Table IV . — Annual diameter growth of Podocarpus imbricatus at top of 
Mount Banahao, Luzon, P. /. Altitude, about 2400 meters. 
[Diameter in growth are given in centimeters.] 
1 ■ 
I 
Diameter class in centimeters. 
I 
! 
No. of tree in class. 
0-10. 
10-20. 
20-30. 
Diam- 
eter. 
Growth. 
Diam- 
eter. 
Growth. 
Diam- 
eter 
Growth. 
1 
7.6 
0.06 
12.8 
0. 32 
20.7 
0. 13 
2 
8.6 
0.06 
13.4 
0.13 
21.0 
0.09 
S 
14.1 
0.17 
21.1 
0.09 
4 
15.4 
0.06 
21.2 
0.22 
6 
16.9 
0. 09 
21.3 
0.03 
6 ... 
16.0 
0. 19 
21.6 
0.36 
7 
17.2 
0.06 
21.8 
0.06 
8 
17.8 
0. 14 
22.0 
0. 22 
9.. 
18.1 
0.06 
22.2 
0.03 
10 
18.3 
0. 16 
22.4 
0.06 
11 ! 
18.7 
0. 13 
22.7 
0. 19 
12... 
19.0 
0. 09 
23.0 
0.36 
13- 
19.4 
0. 32 
23.2 
0. 14 
14 
19.6 
0.08 
23.4 
0.19 
16.. 
23.6 
0.03 
16 
24.0 
0.03 
17 

24.2 
0. 19 
1 18 
■ 
26. 0 
0. 19 
19. 
26.3 
0.14 
20- 
26.6 
0.13 
21 
26.4 
0.22 
22 
1 
26.6 
0. 11 
23.. 
26.6 
0.09 
24- . 
26.7 
0. 16 
26 
26.9 
0.09 
26 
27.5 
0.35 
27 
. 
27.8 
0.06 
29.3 
0. 13 
> 
29-..- 

• 1 ' 
29.4 
0. 09 
so 
29.5 
0.29 
i 
0. 07 
0.14 
0. 16 
167 
71 
67 
1 
