354 
Indian Forest Records. 
[VoL. I. 
The following table shows the present distribution of I and II Class trees 
over the sub-periodical areas : — 
Sub -period. 
Area in 
acres. 
I Class. 
II Class. 
First 
, 
• * • 
14,555 • 
3,315 
3,315 
Second . 
. 
. 
2,799 
;3,198 
2,825 
Third . 
• 
• 
3,192 
13,175 
3,300 
Fourth , 
. 
• 
3,140 
3,518 
3,690 
Fifth . 
• 
• 
• 
2,198 
[2,894 
1,470 
Total 
25,884 
16,100 
14,600 
The following table shows the number of trees which will be available for 
girdling during the first period : — 
Sub-period. 
Years of 
girdling. 
Mean 
year. 
Number available. 
Number to be 
girdled. 
First 
1889-1895 
•1892 
3,315^5 of 3,315=3,519 
3,500 
Second 
1896-1902 
1899 
3,198ii of 2,825=3,676 
3,500 
Third 
1903-1909 
1906 
3,175^1 of 3,300=4,035 
3,500 
Fourth . 
1910-1916 
1913 
3,518ff of 3,690 = 4,937 
3,50O 
Fifth 
1917-1923 
1920 
2,89411 of 1,470 = 3,617 
3,500 
Total . 
19,787 
17,500 
The annual yield being fixed at 500 trees and the sub-periodical girdling 
areas defined, under no circumstances may the total number of trees to be girdled 
in the sub -period be exceeded, nor must the girdling extend beyond the prescribed 
area even if tbs prescribed number of trees be not obtained within it. 
The next example* shows the calculation of a general possibility 
Example 2. General possi- 
bility per 100 Class I trees. 
for every 1,000 Class I trees. The work- 
ing plan is in other respects interesting, 
in that it enters into a discussion as to the 
correct sylvicultural system, to be applied to a Pi'p,us longifolia ^ 
* Working Plan for the Naini Tal Sub-Divisional forests, United Provinces, 
by N. Hearle, 1898. 
