84 
Indian Forest Records. 
[Vol. VIII. 
27*0 inches. The mean girth of a 24 year-old tree according to Leete 
is 31-25 inches; the graph number of beeholes corresponding to this 
girth is 21. As the plantation is slow-grown, the arithmetic mean number 
of beeholes has been chosen as an index of attack for reduction. 
Twenty-eight trees of which the stumps were missing were also 
analysed. For purpose of comparison with, the whole tree data, the 
girths were uniformly measured at 4' 6" from the butt ends. If the 
distribution of beeholes throughout the tree were uniform the data 
in Table 26 below could be compared absolutely with those in 
Table 25, but since this is not so, an approximate comparison only 
is possible. The girth-beehole incidence in the trees minus stumps 
is given in the table below. 
Table 26.— Girth-Beehole Incidence in a 24 year-old Plantation , 
Yanaungmyin , Pyinmana , 1919. [Trees without stumps.] 
3 Inch Girth- 
Class. 
Serial 
Number 
of Sample 
Tree. 
Girth at 
4' 6" 
from 
butt end. 
Number 
of 
Beeholes. 
Arithmetic 
mean of 
Girth- 
Class. 
Arithmetic 
mean 
Beeholes 
per Girth- 
Class. 
( 
6 
16 
6 
16—18 J 
.! 
18 
18 
1 
0 
... 
... 
\ 
19 
18*5 
13 
: 17-6 
*5-0 
* 4 
21-5 
7 
... 
13 
21-5 
13 
... 
... 
19—21 
18 
21 
10 
... 
20 
19 
0 
... 
... 
23 
21 
3 
20-8 
6-6 
2 
24 
10 
... 
... 
8 
22 
1 
... 
... 
9 
23 
9 
... 
... 
22—24 .< 
10 
11 
22 
23 
2 
5 
... 
... 
17 
24-5 
4 
... 
22 
23 
1 
... 
15 
24-5 
5 
23*2 
4-6 
’ 3 
25-5 
7 
... 
... 
5 
25 
11 
... 
... 
25—27 
7 
26-5 
4 
... 
... 
12 
27 
5 
... 
26 
25 
12 
25*8 
7-8 
r 
16 
28 
2 
... 
28—30 . J 
28 
28-5 
21 
28*2 
*ii-5 
31—33 
Nil. 
... 
... 
... 
34—36 
14 
35 
20 
3*5*0 
20-0 
The arithmetic mean number of beeholes per sample tree is 7*0 
and the arithmetic mean girth is 23*2. 
[ 312 ] 
