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4. Interest,— Interest, in connection with forestry, expresses 

 the relation between (a) the money value of the capital 

 invested in the forest, that is, the value of the soil, of the 

 growing stock, the total expenditure incurred on roads, 

 buildings, settlements, surveys, etc., ani (6) the net annual 

 revenue derived from the forest. Problems connected with 

 the interest obtainable under various systems of working, 

 involving the use of mathematical formulae, although of 

 much theoretical interest and of practical importance in 

 countries where forestry is in an advanced stage, have but 

 little application as yet in India, owing to the condition of 

 the forests, and to the want of accurate statistical data relat- 

 ing to the outturn of crops of various ages. Such problems 

 need not, therefore, be here discussed. 



