REVENUE FROM OAK-COPPICE. 511 



German bark-coppice districts, with rotations of 15 to 18 years, 

 60 — 70 cvvt. of bark, and 40 — 50 stacked cubic meters of 

 wood per hectare, may be cited (24 — 28 cwt. of bark, and 560 

 to 700 stacked cubic feet of wood per acre). The longer the 

 rotation, the larger the proportion of wood as compared with 

 bark. 



Careful management has an immense influence on the yield. 

 R, Hess has shown to what an extent this is possible, in his 

 account of the management of the forest range Oberrosbach, near 

 Friedberg, which shows, taking one compartment as an instance, 

 that in sixty years the yield was increased 105 % by careful 

 management. 



The following examples of the yield of bark-coppices per acre 

 are taken from pure oak-coppices of best quality, and under first- 

 rate management : — 



Frauenwald compartment 15 of forest range Oberrosbach, 15 

 years' rotation : 



50 cwt. bark. 



670 stacked cubic feet of wood. 



Thinned forest {Hackicald), forest range Beerfelden, 17 years' 

 rotation : 



40 cwt. bark. 



1,480 stacked cubic feet of wood. 



Forest range Brichold, in Franconia, rotation 20 years : 

 43 cwt. bark. 

 1,030 stacked cubic feet of wood. 



2. Revenue from Bark-Coppice. 



The amount of revenue obtained from bark- coppice depends 

 chiefly on the price of bark, for the value of the peeled wood 

 remains pretty constant in most oak-coppice districts. 



Baur has shown that peeled wood takes up 17 — 30 % less 

 volume when stacked than unbarked wood. These figures, there- 

 fore, represent the loss in volume in firewood due to the barki)ig, 

 but the loss is compensated for by a rise in price owing to the 

 larger volume of wood in the firewood stacks, and its consequent 

 superior combustibility. It is, therefore, even when the price of 



