WHITE PINE IN MIXTURE 29 



One of the commonest species growing in 

 mixture with White Pine, in all situations and 

 on all kinds of soil in central Pennsylvania, is 

 the Red Maple {Acer rubrum, L.). On good 



Fig. 4. 



0 10 20 30 40 Years. 



WMte Pine. 



White Asli. 



Black Birch. 



Black Cherry. 



soils Rock or Sugar Maple {Acer harhatum, 

 Michx.) is also found. Its rate of growth is 

 at least equal to that of the Red Maple, which 

 it far surpasses in economic value. 



