4/6 Forestry Quarterly. 



To show how the calculation is made we translate the sums of 

 the items : 



Area, 2,070 acres; total cut in 70 years, 5,724,000 cubic feet (of 

 which 25 per cent in thinnings) ; latest estimate of stock, 10,630,- 

 000 cubic feet ; stock estimate 70 years ago, 2,000,000 cubic feet ; 

 increment in 70 years by adding cut and present stock, and de- 

 ducting previous stock, 14,354,000 cubic feet ; from which incre- 

 ment per year and acre can be determined and compared with 

 the increment estimate. 



Zuwachsschdtsung verglichen mit dem tatsdchlichen Ertagsergebniss. 

 Forstwissenschraftliches Centralblatt. March, 1914, pp. 149-150. 



Professor Dr. Wimmenauer reports in 

 Financial great detail and with ample tabulations 



Aspects results of experimental thinning in the 



of dominated stand at the station of Hesse, 



Thinnings carried on within the last 25 years, some 



17 areas for pine and beech on plots of 

 two-thirds to two and a half acres being reported. The inquiry 

 was directed not merely to volume but to value production. For 

 the latter to overcome the difficulty of dividing into assortments a 

 value meter (Wertmeter) calculation was introduced. For beech, 

 where at the age of 79 years workwood is as yet not developed, 

 the value meter was determined by assuming brushwood to be 

 Jialf in value of timberwood, hence if there were 60 fm of the 

 latter and 40 fm of the former, this would give 80 zvm, value- 

 meter. For pine the calculation was made differently. Since 

 the relation of assortments in a stand is primarily dependent on 

 the mean diameter of the stand, the assortments corresponding to 

 each such diameter were ascertained and their values in the local 

 market ascertained (since only relative values are to be deter- 

 mined), and then a quantity of wood of the value of 10 Mark 

 was accepted as valuemeter. For illustration : to a 40 cm diam- 

 eter corresponds 40% of sawtimber at 22.6 mk, 40% of building 

 timber at 17.1 mk 10% fuel wood over 3 inch at 5.3 mk and 10% 

 brushwood at 0.6 mk; this makes the average value 16.5 mk. 

 Such a tree would then contain 1.65 value meters. 



The results are somewhat unexpected and disappointing. The 

 beech areas show that total volumes as well as increment per cents 

 under a, h, and c, i. e. light, moderate, and severe thinnings in 



