330 
Indian Forest Records. 
[VoL. I. 
covered with stunted growth, no felling should take place, and where the sal is 
net well represented, even mature trees should be left standing. 
Again, in tlie case of the Nambor forests, Assam,* it was found 
necessary to restrict the selection fellings 
to one-quarter of the stock of exploitable 
mature trees. 
Example 5. One-quarter 
only of exploitable matu re 
trees to be removed. 
The felling rotation adopted is 15 years, viz., half the time believed to be 
taken by a Nahor treef of the 2nd class (4' 6" in girth) to reach the first class 
(6 feet in girth and over). As the trees have not been emunerated, the pos- 
sibility has been fixed by area only and not by number of trees or volume. 
The area has been divided into 15 aimual coupes which, to avoid the labour and 
expense of cutting many additional artificial lines, have been made coterminous 
with the 15 compartments into which the forest is at present divided by existing 
natural or artificial boundaries. 
It is believed that a period of 30 years is required for a Nahor tree of the 
second class to reach the first class. The felling rotation adopted is 15 years, 
as a shorter felling rotation would result in the annual coupes being incon- 
veniently large. Under normal circumstances the fellings would be prescribed 
for one whole felling rotation. But as compartments 9, 10, 11, 12, 13, 14, and 
15 have been already heavily felled over, it has not been considered safe to 
prescribe fellings again in these compartments as concerns Nahor until it is 
seen how far they have recovered from the recent fellings. Accordingly, the 
fellings have been prescribed for 8 years only and in such compartments as have 
been not at all or only slightly indented on up to date. At the end of the 
8 years it will be possible to judge if the compartments mentioned can be 
safely felled over again, or if it will be expedient to leave them as concerns 
Nahor till the end of the second felling rotation. 
The possibility of the difierent compartments in number of trees not 
being known, no attempt to equalise the yield could be made. It seemed, 
therefore, desirable to make the annual coupes coincident with the 15 com- 
partments into which the area naturally falls under the existing system of 
roads and paths, streams and rivers, without making any attempt to equalise 
the area of the annual coupes. Each compartment, therefore, forms an 
annual coupe, and the numbers of the compartments indicate the order in 
which the fellings should normally be conducted subject to the remarks made 
in the preceding paragraph. 
At the end of the first felling rotation sufiieient data for the calculation of 
the possibility will be forthcoming, and it will then no doubt be found necessary 
to re-arrange the coupes so as to equalise the yield. 
The trees are to be felled according to the principles of the method of 
selection fellings. As the felling rotation has been fixed at 15 years (half the 
period necessary for trees of the second to reach the first class), only one-half 
of the exploitable trees in each coupe could under any circumstances be marked 
for felling. But as it is uncertain whether these portions of compartments 9 
to 15 which have been already feUed over during 1901-1903 vrill be in a condition 
to be felled over again during the first felling rotation (and if not, compartments 
1-8 would have to be again felled over during the years 1912 to 1918), it is 
* Working Plan for the Nambor reserved forest, Sibsagar Division, Assam, by 
A. R. Dicks, I.F.S., 1906. 
t Mtsua ferrea. 
