29 



All the suppressed trees should be cut. In the first row, the first 

 intermediate tree should be cut, because it is being overtopped by the 

 adjacent dominant tree and will have passed its prime before another 

 thinning takes place. The second intermediate tree in the first row 

 has room in which to grow for several years and should stand. In the 

 second row the intermediate tree should be removed, because it will 

 be suppressed by the two adjacent dominant trees. In the third row 



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5'suppressed tree. 1= intermediate, D 'dominant; numerals show diameter breast high; /'to be cut 

 Fig. 1.— Method of thinning catalpa plantation No. 5 (see page 10). 



the first two intermediate trees have space in which to grow for some 

 time longer, while the third one has a poorer chance and should be cut. 

 Thinnings are designated as moderate when all the suppressed trees 

 and a portion of the intermediate trees are removed, and as heavy 

 when all the suppressed and intermediate trees and some of the domi- 

 nant trees also are taken out. The thinning just illustrated, there- 

 fore, is a moderate thinning. The suppressed trees might even be left, 



[Cir. 81] 



