Indian Forest Records. 
;138 
[VOL. 1. 
If anything, the stock thus calculated, which will exist after the 40 years 
felling rotation, is below the mark, as the above forecast is only for sound 
trees, and so the percentages taken in paragraph above should probably be larger. 
The period over which the removal of the Class I sound teak and Classes 1 
and II imsound teak might be distributed, was indicated by Mr. H. C. Hill 
to be the period it takes a Class II teak to become Class I, and this period has 
been found to be on an average 63 years. But as this period is supposed to 
be abnormally long, owing to past adverse conditions affecting growth in this 
forest, and as it is desirable to get aU the large unsound trees out of the way 
as soon as possible, it was thought advisable to reduce this period to 40 years, 
especially as the calculation above given shows that the sound trees in Classes I 
and II will be nearly double the present sound stock at the end of the above 
period. It is probable however that two more preparatory periods of 40 years 
will be necessary before a normal growing stock is attained. 
The distribution of the larger trees is very irregular, as can be seen from 
the detailed results of the valuation survey given in the Appendix E, so it is 
necessary for the compartments to be grouped together m five yearly sub- 
periodic blocks, so as to give an approximately regular yield. The order of 
the cuttings is given in the tabular statement of fellings. 
A last example may be quoted, namely, that in which the re- 
, TTT All IT moval is prescribed of such trees of the 
Example III. All sound I i i , • t , 
Class trees pfws trees of second and third class as it may be 
Class II that will never calculated will never reach exploitable 
reach exploitable size. gj^e. Thus in the case of Mr. V. G. 
Morgan’s working plan already quoted,* the following additional 
prescriptions occur : — 
It is, however, also advisable to remove all the II Class trees which are 
unsound, mature or languishing during the same period. By examining the 
enumeration figures in Appendix IV of the working plan report, it would seem 
desirable to remove the 40 per cent, of which the majority are already considered 
to be mature and of which nearly 27 per cent, are already unsound. 
This may safely be done as it leaves 11 trees per cent, more than the number 
in Class I estimated to be standing on the area, or 10 per cent, of the sound 
vigorous II Class trees remaining to allow for casualties, i.e., windfalls, trees 
which dry up or for other reasons do not pass into the 6 feet girth class within 
the average period — among that class, while the remaining 00 per cent. — which 
is equivalent to .74 per cent, of the number of trees in Class II estimated to be 
standing on the area — are passing into Class I, and as the lower girth classes 
are well represented, imsound trees of Class III and lower girth which can 
be utilised will also be removed. 
We thus have the number of trees which may be removed annually as : — 
I Claes trees -I- '4 x II Class trees + unsonnd III Class trees 
30 
25,431 4- 1 8,859 + 5,238 _ 49,528 _ , 
30 30 ’ ° ■ 
Working Plan for the forests of the Motinala Range, Mandla Division, Central 
Piovjncas, by V. G. Morgan, I.F.S., see page 55 ante. 
