138 



FOREST REGULATION 



Fig. 8 illustrates the Regularity of Age Classes on Working 

 Section No. II of the Sihlwald of the City of Zurich, a 78oacre tract 

 of forest on rather steep mountain slopes and frequently injured by 

 heavy snows, and therefore difficult to keep in well regulated 

 condition. 



Cu/C ; 



FIGURI; 8. Diagram of Age Class Conditions on Working Section No. II 

 of the Sihlwald, near Zurich, Switzerland. This Working Section of about 

 780 acres, contains lots No. 9-16 and is ramarkably regular in its age classes 

 in spite of much trouble from snow. Some lots contain timber of more than 

 one 2O-year age class; see lot n with timber in Age Class I and II. After 

 Meister. 



The forest occupies one side of a valley running North and 

 South, cut is from North to South, division into eight lots, the 

 method shelterwood. It will be noted that the age of timber on the 

 same lot may or may not be uniform. Regulation by Austrian 

 Heyer Method is prescribed officially. 



