80 



Applying these results in respect of a forest, of, say, 1,000 acres (wooded area), ex- 

 5)loited at 80 J ears in 80 antual coupes of 12'5 acres each, the yield would he 12"5x 

 y,299 cubic feet, or 116,237 cnhio feet a year ; while the same forest similarly exploit- 

 ed at 120 years (tie age of the highest average yie'd) would produce 8'3X 16,755 

 <"ubio feet= 139,066 cubic feet. The increased yield would not in all oases) justify 

 the retardation of the felling by 40 yeare. When, however, there is a demand' f . r 

 the produce, the greater size of the timbermigbt so enormously increase its valuers 

 to justify felling at the more advanced age. TLus, the 116,237 cnb'o feet produced 

 yearly at 80 years might be worth only four annas a cubic foot, or in all B29,000, 

 while the large pieces obtained from the deferred felling, might lead to an all-mund 

 -*ate of 6 annas a cubic foot, hnd so raise the price of the timter produced yearly to 

 itore than R52,000. Saeh examples are frequent in countries where there is an 

 unlimited demand for the whole of the produce of the forests, bat do not often occur 

 ia India. 



The law of the increase in the value of the produce with 

 Its size is not always true iu India where there are few local 

 indus-tries and where good roads for extracting the produce 

 rarely exist. In order that the rule may hold good there 

 must be a sufiGcient demand and the means for extraction 

 must be adequate. In the hills and out-of-the-way places 

 where forests are found in India, it is often impossible in 

 practice to work out large pieces of timber except at a 

 prohibitive cost. In such cases the means of transport is 

 the main factor in determining the size at which trees should 

 "be felled. There are even cases where, owing to the trouble 

 and cost of converting into smaller pieces, large timber which 

 is not required, the net price of large timber is actually 

 lower than that of small, 



W hen, however, there is no demand for forest produce, especially for large timber, 

 this is generally owing to want of good roads. This defect can often be remedied by 

 a judicious outlay of funds, and should, wherever present, form the subject of careful 

 investigation in connection with the preparation of the working-plan. 



Section VII. — The possibility. 



1, Meaning of flie term.— The most important calculations 

 tind provisions in a working-plan are those which relate to 

 -what is called the possibility. 



Theoretically the possibility is the productive power of 



a wooded area expressed in quantity of material. Praeti- 



•oally it is taken to mean the quantity of material which, 



without infringing the rules of forestry, maybe felled, in a 



forest, annually or periodically, for the time Iseing. This 



latter quantity depends on the constitution of the producing 



TEtock, and on the relation which the stock bears to the age 



of exploitation determined upon. If the forest capital or 



growing stock is sufficient and normally constituted, as in 



^g. 1 for instance, the possibility is equal to the average 



.annual production over the whole area. If, on the other 



