372 Indian Forest Records. [VoL. I. 
whether teak trees should be girdled before they attain 7 feet in girth, or whether 
they may profitably be left until the next period. 
The rate of growth of pyinkado is believed to be slower than that of teak, 
and a tree 7 feet in girth probably takes 200 years to reach it. Seven feet is 
the minimum girth at which pyinkado should be extracted. Cutch may be 
extracted at 4^ feet in girth as that size contains plenty of heartwood for 
boiling. Its rate of growth is about the same as that of pyinkado. Padauk 
grows probably at about the same rate as pyinkado. It should not be extracted 
below 7 feet in girth. 
To determine the rate of growth of teak annual rings were counted on 108 
logs and stumps. Large logs were available in some of the streams, and trees 
were felled of the middle and smaller classes for observation. The average 
radius was determined, and the rings counted on each inch of this radius, 
starting from the pitch. In this way data were obtained from each tree for 
every inch that it has increased in radius during its life. The totals for each 
inch were divided by the numbers of the trees counted and the following results 
were obtained : — 
Inches radius. 
j Corresponding girth. 
Average number 
of rings per inch 
radius 
Number of years 
taken to reach each 
girth. 
' Feet. 
1 Inches. 
1 
i 2 
3 
; 
‘ 4 
5 
1 
6 
5 
.5 
2 
1 
1 
8 
13 
3 
1 
7 
9 
22 
4 
2 
1 
10 
32 
5 
2 
7 
10 
42 
6 
3 
2 
11 
53 
7 
3 
8 
11 
65 
8 
4 
2 
12 
76 
9 
4 
9 
12 
88 
10 
5 
3 
13 
101 
11 
.5 
9 
12 
113 
12 
6 
3 
13 
126 
13 
6 
10 
15 
141 
14 
7 
4 
14 
1.55 
15 
7 
10 
13 
168 
16 
8 
5 
14 
182 
17 
s 
11 
14 
196 
IS 
9 
5 
12 
208 
19 
9 
11 
15 
221 
20 
10 
6 
12 
233 
Allowing ten years for a seedling to establish itself the age of the average 
teak tree 7 feet in girth is therefore about IfiO years. In the nearest adjoining 
reserves for which working plans have been made, this age has been fixed at — 
Years. 
In the North Nawin reserve ...... 150 
In the Kabaung reserve ..... 180 
In the West Swa reserve ...... 160 
From the above table we find that the ages of teak trees at the limits of 
