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Indian Forest Records. 
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X. 
[VoL. 
a very slight extent, it will be found possible to recognise the fol- 
i. — Brandis’ Method. 
ii. — The Oudb Method. 
. J 
iii. — The General Possibility Method. 
IV. — The Burma ilethod. 
V. — The Crown Cover Method. 
vi. — Possibility based on the normal forest. 
It is perhaps unnecessary to point out that many of these methods 
are not altogether theoretically correct. Nevertheless they are 
sufficiently accurate for all practical purposes under the conditions 
frequently prevailing in India where large areas have to be dealt 
with in a short time, and with an inadequate and partly untrained 
establishment. 
A question which however appears to have been frequently over- 
looked in India is that the distinction between the various Indian 
methods {i.e., Methods i to iv above) lies chiefly in correctly realising 
the rotation on which the forest is being worked, that is, the exploit- 
able age of the trees counting against the possibility. It is evident 
that in any given forest, the possibility of which has been calculated 
under Brandis’ Method, the rotation will be a longer one than under 
the Burma Method. For instance, to take a concrete case, suppose 
the minimum exploitable girth be 6 feet, which represents an age 
of 100 years, and that the length of the felling rotation be 15 years 
(the number of years required to pass through a girth class) ; it 
follows that, in the normally constituted forest, under Brandis’ 
Method the average age of the tree felled during each felling period 
would be 115 years; as compared with 108 years, the average age 
under the Burma Method. But this is not all, for though 100 years 
(as represented by a girth of G feet) would be the age of the lowest 
exploitable tree under both Methods, in Brandis’ Method in the nor- 
mally constitxited forest trees varying in age between 100 and ISO 
years (with corresponding girths) would be obtained, wffiereas under 
the Burma Method the age of the trees felled would vary in the 
normal forest merely between 100 and 114 years of age. And the 
Same argument applies whatever may be the length of the felling 
rotation.* 
* See also “ Indian Forester," Volume XXXIII, page 185. 
