Paet IV.] Caccia : Selection method of treatment in India. 367 
Consequently in order that - trees may be felled annually, the 
btock of exploitable trees which must always be standing on the area 
will be — 
X 
n X 
n X — =— trees in the first coupe worked over, 
n n 
X 
n 
jf 2nd fy 
n 
X 
n 
(n— 2)x— „ 3rd 
n 
trees in the (n — 2) coupe worked over. 
X 
n 
lx — 
n 
it 
» (' 1 — 1 ) 
0 „ „ nth 
if 
X 
2 
for the whole forest* 
The possibility so calculated may further be corrected accord iutj 
to the condition of the forest, that is according to the densit}^ of the 
stocking and to the number of trees found to be existing in the older 
girth classes. A few examples taken from existing working plans 
will explain the method of procedure under varying conditions. 
Example 1. The felling 
period = number of years 
passed in the penultimate 
girth cL'ss. 
The following extracts are taken from 
the working plan of the Kabaung Re- 
serve, Lower Burma*. 
The object to be attained is to obtain as large a yield as can be extracted 
without infringing on the normal stock of the forest and which can be main- 
tained equally from year to year. 
* Working Plan of the Kabaung Reserve, Toungoo Division. Tenasserim Circle 
Burma, by H. Carter, I.F.S., 1895. 
G 
