INCREASING THE YIKI.D. 



39 



FIG. G. A second-growth stand of mixed hardwoods which contains a large 

 number of medium sized yellow poplars. A diameter limit (selection system) 

 for cutting could advantageously be applied to this stand since it contains 

 many small and medium sized trees. Openings- should be made sufficiently 

 large, however, by group cutting to ensure the replacement of poplar on them, 

 since the site is evidently well suited to the growth of this species. The ab- 

 sence of young growth indicates that the present forest cover is dense. ( Photo 

 Forest Service. ) 



