346 
Indian Forest Records. 
[VoL. I. 
The present stock of sal and seiu is estimated to be as follows : — 
Girth. 
Trees. 
Class I ........ 
Over 6 feet 
5,814 
„ II (oj 
5 feet to£ feet 
13,372 
„ II (i) 
4:) „ too „ 
14,363 
„ III 
0 
CO 
74,510 
It may be presumed that as the whole of II Class will probably become 
Class I in 30 years, Class II (a) will not take more than 24 years to become 
Class I, and probably not more than 20 years. 
The stock in Class II (a) comprises 50 per cent, of stems which it is con- 
sidered will never mature, while Class II (b) has also many unsound stems 
(estimated at one-sixth of the whole). 
The maximum annual possibility has, therefore, been calculated as fol- 
lows : — 
i ■ y“-+_ii2_ 
24*^ 2x 24 4x24 6x 24 
which comes to 760 trees. 
Mature trees of species other than sal or sein are not included in this figure. 
Again, to instance the Sukna sal forests of the Kurseong Divi- 
sion * : — 
The possibility of the Terai felling series has been calculated on the assump- 
tion based on results of measurements recorded in the Appendix, that the 
average annual diametral increment of a second class tree is one-fifth of an 
inch a year; in other words that the smallest sized-trees of the second class, 
over 1 foot 6 inches to 2 feet diameter, will attain a diameter of 2 feet in 
30 years. On these grounds it appears justifiable to cut all the existing first 
and half the existing second class trees in the next 30 years, and that the 
7 234 + - *’^^° 
possibility works out to ’ = 1,157 or, say, 1,150 trees. 
Proceeding on the same lines, the maximum limit will eventu- 
ally be reached, that is, the case in which the whole of the II Class 
trees, which it is estimated will survive to pass into the first class, 
are also brought into the possibility. 
Taking into consideration the selection forest as a whole in which 
the Class II trees are normally distributed, the number of Class II 
trees that will annually reach exploitable dimensions will be equal 
to the whole of the Class II trees (less casualties) divided by the 
* Workins Plan for the reserved forests in the Kurseong Division, Bengal, 1905, 
by C. C. Hatt. 
