40 



LOBLOLLY OR >'ORTH CAROLIXA PIXE. 



Barl. 



The bark of small trees forms about 30 per cent of their volume; 

 that of large trees about 15 per cent. In large trees the bark near the 

 base of the tree is 3 to 6 inches thick and forms a great protection 

 against fire. Above 2 or 3 feet from the ground it becomes thinner, 

 seldom exceeding I/2 inch in thickness at the base of the crown. The 

 outer bark as it falls from the stem forms a mound of debris at the base 

 of the trunk, at times 2 feet high and 5 or 6 feet wide. Unless this is 

 removed, the stumps are apt to be cut high. The bark is much thicker 

 on young thrifty trees than on slower growing older trees of the same 

 diameter and height. Table 10 gives the thickness of bark at breast 

 height for trees of different diameters and heights, and is an average 

 of both young and old. Below breasthigh the bark is much thicker as 

 shown in Table 11. 



Table 10. — Thickness of Bark at Breastheight axd Diameter of Stem Inside of Bark at 



Brbastheight on Trees of Loblollt Pine of Different Diameters and Heights. 



Trees With Piameters Below 23 Inches Abe Less Than 75 Years Old. 



Table 11 shows the comparative average thickness of the bark on the 

 stump of trees of the loblolly, longleaf, and white pines of different 

 sizes : 



