Forest Mensuration 



SAMPLE. 



Grand total.. 



196.580' B. M. 



The volumes of the column "Average Volume" are taken from tables 

 published by the Bureau of Forestry. 



PARAGRAPH LIII. 



YIELD TABLE METHOD. 



All over Europe local yield tables are used to quickly ascertain the 

 volume of pure, sound, even aged woods. For America, such yield tables 

 normal local yield tables exist only in the white pine tables given in 

 Pinchot and Graves' pamphlet, "The White Pine." 



The method of construction of yield tables appears from Paragraph 

 XCII. and following. 



Under yield tables are understood "acre-volume-tables," whilst under 

 volume tables are understood "tree-yield-tables." 



Normal yield tables specify the age of even aged and pure woods, the 

 height of such woods and the volume (by assortment) of such woods, 

 according to the productiveness of the soil. An indication for the latter 

 is found in the height growth. 



Such yield tables hold good only for woodlots normally stocked. A 

 woodlot is normally stocked "when all local factors of wood production 

 have pronounced themselves unhampered in the annual production of 

 fibre." Normal woods, even of small extent, are extremely rare. In Ger- 

 many the average wood lacks 25% of being normal. Since the normal 

 yield tables give the yield for normal conditions only, a deduction must 

 be made from the volume indicated by the yield table when applied to 

 a given woodlot, according to the abnormality of the same. 



Proceed as follows: 



