546 



PROTECTION AGAINST WINDS. 



10 years old. 30 years. 50 years. /O years. 



Fig. 249. Plan of part of the Zellaer Forest, with 3 severance-fellings, a b e. 



JO 



.10 



C 



SO 



East 



Fig. 250. Section of the wood along A B. 



The numbers refer to the average age of the wood, a b c Severance-fellings, d Road. 

 The 10-year-old wood is a protective plantation. 



