Part IV.] Catcia : Selection method of treatment in India. 379 
Trees for felling should always be selected by an experienced officer, who 
should observe the following rules : — 
(i) The minimum girth for felling is 7 feet at breast height and no trees 
should be marked below that girth except as provided below. 
(ii) No isolated tree must be marked unless there are young teak, padauk 
or pyinkado trees in the immediate neighbourhood. 
(iii) Unsound trees, and those growing on the poorest localities, may be 
marked below 7 feet in girth, if they will yield marketable timber, 
and if they are not required as seed bearers. 
In the following example* the possibility is calculated on the 
number of trees which it is estimated will 
Example 3. Possibility cal- annually reach exploitable dimensions 
the rotation. during the whole period oi the rotation, 
the removal of the excess trees being dis- 
tributed throughout the rotation. The Deoban forest is a mixed 
silver fir, spruce, oak, deodar, and Finns excelsa forest; and the 
possibility in the case of the firs is calculated as follows : — 
The following statement shows the exploitable size and age of the fir trees, 
as well as the number of years they are supposed to remain in each class : — 
53 -a 
!z; g.S? 
■ S 2 
© V 
“^2 
^ .FN 
6.0“’ 
.s •§ 
20 
p lO © 
® 2 
^ = I 
C4_, •. a 
P 
S „ 
3 bL 
22 
o § - 
o ® 
u ^ 
u o 
ffl g a 
-D 0| 
^ 2 o 
f O a- 
22 
; s ^ 
* ® 
' .> 3 
, ca 
! 
J 
i 
I w ^ 
c3 a- 
i ® 
26 
® o 
ce ^ 
§.2 
"o a si 
o ® 
© 
fe s 
1 1.5 
30 
«4-l 
o 
w © 
© N 
U ® 
© 
be*!- 
<A 
C6 
“o 
-2 a 
H 
Eh 
w 
120 
24" 
The felling cycle has been fixed at 40 years ; and the following are the 
estimated figures of the percentage of trees which pass from one class to 
another : — 
95 per cent. Class I survive for 40 years. 
80 per cent. Class II become Class I. 
75 per cent. Class III become Class II. 
60 per cent. Class IV become Class III. 
331 P®*" cent. Class V become Class IV. 
* Working Plan for the Government forests in Jaunsar-Bawar, United Pro- 
vinces, (Deoban Working Circle), by P. H. Clutterbuck, I.F.S., 1901. 
