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 quality of site. When these conditions are met 



40 



f 30 



f 

 *S 



20 



10 



& 



^_ 





20 



40 



100 



120 



Age in Years 

 FIG. 39. 



140 



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- 

 the selection method finds favor principally for use on 

 where a protection forest is needed. Switzerland has 



a higher percentage of protection forests than have other 



