Part V.] Statistics compiled in the Silviculturist s office. 
Summary of results of measurements in Divisional Sample Plots. 
Species— DUABANGA SONNE RATIOIDES. 
Darjeeling Division , Bengal Province. 
Sample Plot. 
Sambong III. 
Mangwa V. 
Combined. 
Thinned or Unthinned. 
Unthinned. 
Unthinned. 
Unthinned. 
Period of measurement . 
1911 to 1917 
1906 to 1910 
1906 to 1917 
Total number of measurements. 
35 
20 
55 * 
Rate of growth in girth. 
Age in years. 
10 
20 
30 
40 
50 
60 
70 
Ft. in. 
0 * 
0 ! 
m 
8 
6J 
6* 
4i 
Ft. in. 
Ft. 
2 
2* 
* 0" to 12"—No. of measts. nil , 12 " to 24'—6 measts., 24" to 36'—8 measts., 36* 
bo 48'—-10 measts., 48" to 60"-9 measts., 60" to 72'-16 measts., 72' to 84 -5 measts., 
84 7 to 96'—1 meast. = 55 measts. ... . 
Note.— Nothing has been added for the time required for the seedling to establish 
itself. _ 
Record of Periodical Volume measurements in Forest Research Institute Plot. 
Species —CINNAMOMUM CAMPHORA. 
Experimental Garden, Dehra Dun. 
Number of Sample Plot. 
Year of measurement. 
# 
Age of crop. 
I 
Species. 
Number of stems per acre. 
Mean girth at 4F from ground. 
Mean height of crop in feet. 
Volume per acre 
IN SOLID 
CUBIC FEET. 
INTERMEDIATE YIELDS PER ACRE 
FROM THINNINGS. 
Timber over 24" in 
girth. 
Small wood 6"—24" in 
girth. 
Total. 
PERIODIC YIELDS. 
Total to date. 
Remarks. 
Number of 
stems. 
Timber over 24" 
in girth. 
Small wood 6"— 
24" in girth. 
Total. 
Timber over 24" 
in girth. 
1 Small wood G"— 
24" in girth. 
Total. 
3 
1914-15 
17 
Cinnamomwn 
1 
! 561 
17-5 
53 
109 
2,257 
2,366 
492 
885 
885 
885 
885 
Plantation. 
C amphora. 
1916-17 
19 
1 
' 383 
21-2 
54 
570 
1,743 
2,317 
183 
648 
648 
1,533 
1,533 
[ 285 ] 
