PLATE XIII. Typical boards of important grades of North Carolina pine lumber 12 feet 

 long. A to D, inclusive, are dressed boards; E and F are rough. (Photographs made 

 under direction of author.) 



A. No. 1 grade board, 16 inches wide, from a large, old, fine-grained heart tree of the qual- 



ity known as "slash pine." A narrow margin of sapwood is shown on either edge of 

 the board. 



B. No. 2 grade board, 12 inches wide. The defects are a small pin knot and a narrow pitch 



streak in the iipper one-half of the board. Board from an old growth, fine-grained 

 tree, very largely heartwood. 



C. No. 3 grade board, 12 inches wide. The defects are a pitch pocket in the lower one- 



fourth, two pin knots near the middle of the board, a pitch streak at the upper end 

 of the board, and a sliver in the coarse flat grain of its center. Board is from a 

 second-growth forest tree, coarse-grained in the center and medium-grained on the 

 edges. 



D. Box or No. 4 grade board, 12 inches wide. Very knotty and coarse-grained. This 



board is from a rapid growth tree of the old-field type and is all sapwood except a 

 narrow ribbon of heart down the center. 



E. Merchantable red heart grade board, 10 inches wide. This board would have graded as 



a No. 3 but for the red heart which shows as the dark streaks in the heartwood. 



F. Box bark strip. The bark edge shows along the upper right-hand edge of the strip; the 



bark has been trimmed from the lower portion of the piece. 



