nnwwrrv of ill ws library 
44 
Indian Forest Records. 
[Vol. VI 
The third pair were laid out in Gothan forest by Mr. McIntyre in 1894. 
Aspect N.W., Elevation about 7,000 feet, Slope 20°, Age in 1894 — 
90 years, Height 85 feet. Soil clay. Closed to grazing since 1885. 
UNTHINNED PLOT. j THINNED PLOT. 
Area on the slope -63 acre. I Area on the slope -63 acre. 
No. of 
trees. 
i 
Sectional 1 
area { 
(sq. ft.) | 
No. of 
trees. 
Sectional 
area. 
(sq. ft.) 
1894 . 
140 
175-8 
i Originally . 
128 
1899 . 
141 
162-9 
I After thinning— 
1912 . 
, m 
137 
190-4 
1894 . 
98 
148-6 
1899 . 
69 
104-4 
1912 
67 
124-7 
The unthinned plot shows a difference of 27'5 square feet or 17 'per 
cent, increase in 13 years. 
The thinned plot shows a difference of 20 3 square feet or 19 per cent. 
increase in 13 years. 
The actual increment is again less in the thinned plot, but the indivi¬ 
dual trees have grown rather more rapidly as the percentage of increase 
is greater than in the thinned plot. 
The absence of any marked stimulus to growth suggests that when 
thinning has been deferred to so advanced an age as 90 years, the utility 
ot the operation is open to considerable doubt. 
Stem analysis of a Tsuga Brunoniana tree in Ramam forest, Singa- 
lila Range, Darjeeling Division, growing on a well-drained spur . Soil — 
loam. Undergrowth .—Arundin aria racemosa bamboo. Elevation, 8,500 
feet. Age , 52 years. Total height , 67 feet. Girth at b.-h.j 58 inches. 
(Data collected by the Forest Research Institute.) 
Age 
(years). 
Height 
Diameter (inches) at a height of 
* Volume 
(feet). 
1' 
5' 
15' 
25' 
35' 
45^ 
55' 
60' 
(cub. ft.). 
CM 
CM 
5 
1 
m m 
CD 
10 
6 
•5 
•5 
.. 
.. 
• . 
" 
15 
13 
2-2 
2-3 
.. 
.. 
•3 
/20 
20 
4-3 
4-3 
1-7 
1-2 
CM 
25 
27 
6-5 
6-2 
3-9 
”•8 
.. 
.. 
2-9 
30 
34 
8-7 
7-9 
5-8 
2-5 
.. 
5-6 
>- 
35 
41 
12-0 
10-1 
8-8 
5-0 
2-5 
11-4 
C 
40 
48 
15-3 
12-6 
11*5 
8-1 
5-4 
*1*4 
21-1 
45 
55 
17-8 
14-2 
13-0 
10-2 
8-0 
3-7 
30-3 
50 
63 
20-4 
16-2 
14*2 
12-2 
9-6 
6-1 
2*4 
’*•8 
40-7 
55 
71 
•• 
• • 
• • 
• • 
47-0 
* Volume calculated by 7Tr 2 method. 
[ 302 1 
