82 
Indian Forest Records. 
[VOL. VIII. 
Ihs arithmetic mean girth of the sample trees is 20 inches ; the 
arithmetic mean number of beeholes per tree is 6*8. The mean girth 
cf a normal 23 year-old tree should be 30 inches, and the graph beehole 
value for this girth is 14*25, the graph beehole value for a 20-inch tree 
Deing 5*75. By selection (with reference to the analyses carried out 
in the following year, see later, pp. 83-85) the mean sample tree for 
this area has a girth of 26 inches ; the girth-beehole curve gives 9*9 
beeholes for this girth. 
Annual Incidence. —The annual incidence is given in Table 24 
and is shown in the Annual Incidence Chart as Group 3 (broken 
black line) of the Yanaungmyin series. Owing to the large number 
of suppressed trees only 14 out of the 22 could be reliably dated. 
Table 24 ."Annual Incidence in a 23 year-old Plantation , Yanaung¬ 
myin Pyinmana, 1918. 
| Serial Number 
of Sample 
Tree. 
Girth in Inches.j 
o | 
os 
oo 
lO 
OS 
oo 
© 
o 
OS 
1 
j 
<M 
o 
os 
o 
OS 
O 
05 
lO 
o 
05 
N 
o 
OS 
: oo 
o 
OS 
OS 
o 
OS 
1910 
05 
OS 
00 
05 
05 1 
1915 
CO 
05 
t- 
CS 
■< 
H 
O 
EH 
174 D 
18 
1 
0 
0 
0 
0 
0 
0 
2 
0 1 
0 
l 
0 
4 
200 A 
34 
l 
0 
0 
1 2 
2 
0 
2 
6 
3 
3 
1 
3 
2 
25 
152 E 
26 
2 
0 
0 
1 
1 
0 
0 
0 
0 
4 
154 . 
21 
1 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
1 
0 
0 
3 
0 
0 I 
5 
172 A 
22 
3 
3 
1 
2 
2 
o 
11 
142 . 
33 
2 
1 
0 
0 
0 
0 
6 
0 
1 
1 
0 
0 
0 
2 
3 
1 ! 
17 
162 B 
29 
. . 
m # 
2 
0 
0 
0 
0 
0 
0 
0 
1 
3 
2 
3 
5 
3 
0 
19 
134 C 
25 
1 
3 
0 
1 
0 
1 
6 
152 A 
16 
1 
0 
0 
0 
0 
0 
0 
1 
0 
0 
1 | 
3 
130 . 
19 
2 
1 
2 
4 
0 
o 
9 
129 A 
25 
1 
0 
0 
1 
0 
2 
5 
5 
3 
0 1 
17 
133 C 
31 
1 
0 
0 
i 0 
0 
0 
0 
166 . 
24 
.. 
5 
5 
5 
5 
3 
0 
i 23 
132 A 
20 
2 
0 
! i 
i _ 
0 
0 
r 
Total 
1 
0 
\~ 
3 
0 
1 
1 1 
1 
9 
4 
1 
5 
23 | 24 1 20 
| 29 
18 
L 5 _ 
147 
Reduced 
Values 
0-07 
0-0 
0-1 
0-2 
0-0 
1 
0 - 07 0 - 07 
1 
0 - 07 
i 
0-6 
0*3 
0-07 
0-3 
1-6 
w 
l w 
! 2-0 
1*2 
; 0-3 
9*9 
In August 1918 the plantation was thinned by the Burma Forest 
School and several trees were inadvertently cut out of the sample plot. 
It was later demarcated and surveyed, and the positions of the 85 
remaining trees plotted. 
1919. In April 1919 the area was again visited by the Forest 
Zoologist and trees felled in the thinning of August 1918 were used 
for analyses. In all 67 trees were analysed, but for 28 of these the 
stumps could not be located and the true girth breast-height and the 
true number of beeholes were not determinable; they are therefore 
considered separately. 
[ 310 ] 
Total 
