Periodical Literature 



757 



In investigating the material collected for the single tree tables 

 the interesting discovery was made, that just as there is a per- 

 centic relation between timberwood volume and assortment, so 

 there is a percentic relation between total basal area and the volume 

 of each size class, and similarly the assortment contents, at least in 

 the timber forest. In selection forest the basal area per cent in 

 the lower stem classes is 2-4 per cent higher in the upper classes, 

 2-4 per cent lower than the volume per cent ; in the middle classes, 

 however, the percentages are alike. 



Thus for the size class 37-50 cm of spruce the percentages of dif- 

 ferent assortments based on top diameters 32 24 18 15 12 7 cm 



are for all height classes 57 84 93 96 98 100 % 

 For incomplete size classes the percentages will, of course, have 

 to be reduced, guided by the single tree assortment tables. 



The completed stand assortment tables requiring properly less 

 accuracy, are simpler than the single tree tables. There are only 

 five size classes ; the height classification is based on 5 m differences 

 and only the percentage of the assortments, with their length for 

 different height classes, is given. 



The following example shows the procedure : A stand of spruce, 

 with few firs intermixed, gave a content of 5210/m. From experi- 

 ence of a neighboring felling the amoimt of fuelwood is ascertained 

 as 25 per cent =1303 fm, requiring, therefore, 3907 fm to be as- 

 sorted or graded. The following tabulation taken from the tables 

 can be made use of to show possibilities : 



From this we can choose according to local usage, say, 

 Saw timber, top diameter 32 cm, from 38-50 cm class .... 507 fm 

 Building material, top diameter 18 cm, from 38-50 cm 



class 828-507 321 



