THE (IROWING STOCK. 255 



in judging the results of the past method of treatment and in 

 determining the future treatment. 



/. Volume. 



All methods of determining the yield in material require a 

 measurement of the volume, but to a different extent. For 

 some, it is necessary to measure all woods, excepting only those 

 which are very young, and which are estimated, either direct, 

 or with the assistance of yield tables. For other methods, 

 only those woods require to be measured, which will come 

 under the axe during the immediate future of, say, 10 to 20 

 years. 



Where a fine financial management is followed, all woods 

 which are close to ripeness, or of which the ripeness is 

 doubtful, must be accurately measured, so as to calculate the 

 per cent., with which the capital is working. 



For the determination of the capital value, an accurate 

 measurement of the volume is indispensable. 



The volume should be given separately for the difl'erent 

 species, if their value per unit of measurement difters con- 

 siderably. It is useful to give all volumes in the same measure, 

 as solid cubic feet. The proportion between the difierent 

 classes of produce need only be given for each working 

 section ; best according to local proportionate figures, if such 

 are available. 



The difierent methods, according to which the volume can 

 be measured, have been described in Forest Mensuration. 

 The choice of the method of measurement depends on the 

 circumstances of each case. 



g. Imrement, Capital Value, and Forest Per Cent. 



These matters have already been dealt with in full detail. 



The determination of the quantity increment is required 

 for the calculation of the yield. It must be done for all 

 woods, if the increment forms the principal basis for the 

 determination of the yield. In that case, both normal and 



