II 



Figure i. Pure stand of White Pine. Diameter, 5 to 10 

 inches; height, 45 to 55 feet. The stand is in need of simple 

 improvement cutting. The trees to be removed on this prin- 

 ciple are numbers 2, 4, 5, 7, and 9, all of which are either sup- 

 pressed or partially suppressed, but still restricting the crowns 

 of the better trees beside them. The trees left are vigorous 

 enough and thick enough to restore the cover in a few years. 

 The lower diagram shows the stand before thinning, and the 

 upper diagram the same stand after the trees marked for cut- 

 ting have been removed. 



Figure 2. A stand of White Pine mixed with Gray Birch. 

 Age, 25 to 30 years ; diameters, 4 to 7 inches ; heights, from 30 

 to 35 feet. The treatment is the removal of inferior trees which 

 are crowding the better individuals. The Gray Birches, besides 

 having almost reached maturity, are crowding the more valu- 

 able Pines. White Pine 2, 3, and 5 should be cut to relieve 

 I, 4, and 6; 9 to relieve 8 and 10; 11, 12, and 14 because they 

 are either overtopped or falling behind. Gray Birches i, 2, and 

 3 should be taken out to release the better trees which they are 

 crowding. Lower cut before cutting; upper cut after cutting. 



