io6 



THE SELECTION METHOD 



comparisons between the two. To gauge the relative pro- 

 duction of two methods the same intensity of application must 

 be employed in the management and the two stands must be 

 on the same quahty of site. When these conditions are met 



COr 



50 



40 



13 



;3o 



'53 



20 



10 



20 40 60 80 100 120 140 



Age in Years 



Fig. 39. 



Diagrams showing the height growth based on age of the two hemlock trees 

 used in Fig. 38. Tree A grew under conditions prevailing in an unevenaged 

 stand; tree B under those prevailing in an evenaged stand. 



the production of evenaged and unevenaged stands should be 

 equal. 



Application of the Selection Method. — In European coun- 

 tries the selection method finds favor principally for use on 

 sites where a protection forest is needed. Switzerland has 

 a higher percentage of protection forests than have other 



