334 
Indian Forest Records. 
[VoL. I. 
An example taken from a Working Plan recently compiled will 
perhaps best exjjlain the method of procedure. 
In the case of the Motinala forests of the Mandla Division, Cen- 
tral Provinces, the exploitable tree has been defined as one with a 
minimum girth of 6 feet breats high. It has also been calculated 
that a tree with a girth of 5 feet becomes exploitable, that is, attains 
a girth of 6 feet, in a period of 30 years. The enumeration surveys 
give the following results, viz . : — 
Number of trees. 
Class I, above 6' in girth ...... 25,431 
„ II, 5' to 6' 47,148 
,. Ill, 4V to 5' 61,859 
Total . 134,438 
Bearing these figures in mind, the following extract will explain 
the manner of calculating the possibility. 
It has been determined .... that trees of 6 feet in girth throughout 
the forest are exploitable. The removal of these trees will be spread over a 
period of 30 years, the time required for a 5 feet girth tree to attain a girth of 
6 feet. In other words, the number of I Class trees which may be removed 
annually is : — 
The total enumerated number of I Class trees 25,431 
The number of years required to replace them 30 ~ 
It is evident that the possibility so calculated will require modi- 
fication according to the present condition of the growing stock. On 
the one hand the full possibility as above calculated under this 
method may be increased by the number of trees in the girth classes 
immediately following, that is, in Classes II and III, which it may 
be calculated will never survive to reach the exploitable girth. On 
the other hand, it may be found necessary owing to the forests being 
poorly stocked, or owing to the higher girth classes being badly 
represented, to reduce by a suitable amount the annual possibility 
as above calculated. A few examples will explain the method of 
procedure. 
In the Oak High Forest Circle of the Kangra Forest Division, 
Example I. A proportion Punjab,* it was calculated that the time 
only of I Class trees are re- necessary for an Oak of 4 feet ffirth to 
moved during the first felling , . r.,, ■ ,i i •, • n 
rotation. attain a o' U" girth (the exploitable size^ 
* Working Plan for the Kangra Forest Division, Punjab, 1905, by G. 
Hart, I.F.S. 
S. 
