542 Forestry Quarterly. 



assortments and securing under economically sound conditions 

 the highest possible money yield". For the basis of rotation are 

 to be ascertained : the proportions of dififerent assortments in the 

 timberwood yield ; their net average stumpage price ; the average 

 price per unit of timberwood ; the volume yield per unit area ; the 

 value of intermediate yields per unit area for the whole "growth 

 time" (rotation) ; the decennial value increment per unit area; the 

 net forest rent during the decades and its decennial increase. In 

 addition, the Pressler increment per cent, is to be ascertained 

 in order to come to an appreciation of the relation between value 

 increment and cost of production. Other considerations not 

 mathematically expressible enter in determining the rotation, 

 which is to be chosen so as to be divisible by ten (hitherto in 

 Bavaria the duodecimal system was in vogue). In selection 

 forest instead of a rotation "the average breast high diameter 

 which promises the relatively highest yield" determines the fel- 

 ling time. 



Budget regulation is done mainly by area with the very general 

 instruction that "an uneconomic accumulation of overmature 

 stands on larger areas is as far as possible to be avoided; the 

 budget area should also as a rule not be larger than the total area 

 of the stands that need to be cut, that are mature or will become 

 so in the next 20 years", the condition of the older stands being of 

 first consideration, although if age classes are unevenly distributed 

 deviations from the normal felling area are permissible. The 

 felling plan is made for only ten years, based upon the total 

 felling area determined for the 20-year period. The assignment 

 of stands to be cut is made under the usual sequence of selection. 

 No requirement is made for equalization of volumes or for re- 

 serves. 



The plans are to be revised every ten years. 



We see that the strict sustained yield management is given up 

 as far as volumes are concerned. This on the ground that on 

 large forest areas volumes are equalized if areas are nearly equal, 

 an argument which the reviewer considers dangerous, where a 

 surplus of old stands exists. He also questions the practicability 

 of securing all the data needed to determine the stand values and 

 forest rent, and as to securing the most marketable dimensions, 

 who can predict which they will be at the end of the rotation? 



