500 Forestry Quarterly. 



The significance of this distinction is shown in an example of 

 the soil rent theory and another in taxation of forests. 



Der Wert des Zuwachses und der Wertssuwachs. Centralblatt f. d. g. 

 Forstwesen, March, 191 1, pp. 109-112. 



Schickhardt makes an elaborate calculation 



Valuation to determine the value of the 450,000 acres 



of of productive areas of State forests. An 



Wiirttemberg official calculation had made the value 



Forests. around $97,000,000 with a 3% return, while 



Dr. Wagner believing the used interest rate 



too high makes the capital value over $110,000,000. 



The author in determining the forest capital makes volume 

 calculation for 20 year age classes, reducing the yield table data 

 by estimated actual average degree of full stands. For the two 

 youngest age classes, stand cost values are used, for the others 

 sale values determined by a special index method. The data is 

 tabulated. They show the youngest two age classes to occupy 

 each 22 per cent, of the area, the subsequent age classes represent- 

 ing 16, 15, 13, and the one over 100 years, 12 per cent., Site 

 classes by species show spruce and fir as representing 60%, pine 

 10%, beech 30%, mostly in II and III site class, the average pro- 

 duction for each of these three types 105, 57, and 55 cubic feet 

 per acre respectively. Both main and intermediate stand are de- 

 termined in volume., the latter ranging from 4 to 5% of the main 

 stand. 



The total stock including intermediate stand, without deduc- 

 tions for quality of stands figures out from yield tables 1,588 mil- 

 lion cubic feet. The main stand therefore, 3,350 cubic feet per 

 acre average, while the normal stock would be 3,575 cubic feet. 

 This makes the actual average rotation 95 years and not the calcu- 

 lated 103 years. Various considerations lead to a reduction 

 figure of .75 on the average for incomplete stands making the 

 actual stock on hand 1,190 million cubic feet or say 2,600 cubic 

 feet per acre. 



Authorities differ as to how to evaluate large forest areas like 

 the one involved. 



According to Judeich the cost value of stands should be the 

 basis ; according to Martin, stands up to 40 years should be figured 

 at cost value, the older according to sale value with interpolation 



