STORMS. 645 



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. 



Fig. 248. 



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 affords protection against storms. 



The principal rides should be parallel to the storm-direction, 

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

 storms. 



F.P. N N 



