540 



PROTIXTION AGAINST WINDS. 



Stern h e r<i r 



p£ ' 



&!'.ll 



'1 



?Ai^ 



ffrr,^. /"^"^^ 



T'^Kmw-/-^ 



'HHSL 





Scale ^^1 



III. 



II. 



D 



10 years old. 30 years. .50 years. 70 year.s 



Fig. 249.— Plan of jiart of tlic Zellaer Forest, with 3 severance-fellings, a It c. 



ttMi 



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



Tlie numbers refer to the average ag^of the wood, alt c Severance-fellings, d Koad. 



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



