STORMS. 



545 



planted up, and thus itself form a protective zone when the 

 woods beyond it have been felled. 



The young wood must be 10 — 20 years old, before the felling 

 of the old wood in front of it begins. Severance-fellings 

 should not be risked in woods more than 50 years old. 



Severance-fellings favour the system of small felling-areas, 

 which have many great advantages. "We must not, however, 

 go too far in this matter. There is certainly a loss of yield 

 in making a severance-felling, as part of an immature crop 

 is sacrificed. The financial aspect of the question must 

 therefore be considered, and whether the danger from storms 

 justifies the sacrifice. 



Severance-fellings are very extensively used in the 

 Thiiringian forest, and in the Saxon State forests. 



When felling actually commences in a crop protected by a 

 severance felling, a protective belt should be left along its 

 eastern border, consisting of a double or treble row of trees, 

 the crowns of which have been thinned by lopping away some 

 of their branches, as shown in Fig. 248. 



V. Felling-areas should have long straight boundaries, as 

 fellings in outlying corners of a forest may easily admit 

 storms. 



vi. A system of rides with storm-firm borders should be 

 laid out, which afifords protection against storms. 



The principal rides should l)e parallel to the storm-direction, 

 and the secondary rides at right angles to it, so as to face the 

 storms. 



F.P. 



NN 



