318 
Indian Forest Records. 
[VOL. I. 
Girth. 
Average number of 
trees obtained by 
actual enumeration. 
Eatio between the number of 
trees 'in successive 
girth classes. 
Over 6' . . . . 
1 
iy—6- .... 
k-84 
2-84 
3'-4F .... 
8-10 
2-85 
Theoretically the whole area of a selection forest should be work- 
ed over annually in order to obtain the material annually becoming 
exploitable. In practice this procedure is for obvious reasons im- 
practicable and inexpedient. On the one hand, it is impossible to 
work over too large an area yearly; on the other hand, it is in- 
expedient for cultural and other reasons to work over the same area 
at too frequent intervals. The practice has in consequence arisen 
of fixing a so-called “felling rotation” during which period the 
forest is worked over in regular order. 
The various arguments which may be taken into consideration in 
fixing the felling rotation may be summarised as follows: — 
1. The felling rotation must be short in order to permit of 
the extraction of deteriorating trees before these lose 
their value. 
2. The length of the felling rotation must be sufficient to 
repair all damages which may have been caused in fell- 
ing over the area and in extracting the produce. 
3. A very short felling rotation may give too large felling 
areas, and thus inordinately increase the cost of extrac- 
tion. 
4. A short felling rotation may necessitate too frequent re- 
enumerations, which unnecessarily increase expendi- 
ture. 
5. A long felling rotation leads to koo heavy an exploitation 
in each felling area. If 4 per cent, of the grow- 
ing stock represents the possibility of the whole area- 
20 per cent, would be extracted over each portion of the 
area with a 5-year felling rotation; and 60 per cent, 
with a 15-year felling rotation. 
