RENTAL OP FORESTS. 155 



2. Rental of the Growing Stock. 



This is calculated from the value of the growing stock in the 

 same way as in the case of the soil rental. 



3. Rental of the Forest. 



The rental of the forest is equal to the net return yielded hy 

 the forest (soil plus growing stock). In the case of the 

 annual working, the forest rental is equal to : 



R f =Y r +T a +. . . + T q -(c + rxe). 



If Y r , T a . . . c and e refer to the unit of area, the 

 rental for the unit of area is : 



Unit of area R f = Y r+ T <* + - 



