. Bulletin. Forests and forestry. PLATE XI. THE STRUCTURE OF WOOD. 1. Cross section of six-year old stem of White Pine showing (b) bark, (c) cambium, (ar) annual ring, (p) pith, and (rp) numerous small circular resin passages, natural size. 2. A resin passage with bounding epithelial cells, enlarged. 3. Non-porous wood of White Pine showing (spw) spring Avood, (sw) summer wood, (ar) annual ring, and (rp) resin passage, x 3. 4. Ring-porous wood of Chestnut, x 2. 5. King-porous wood of Red Oak, showing large medullary rays, x 3. 6. DifL'use-porous wood of Beech, x 4. 7. Block of Chestnut wood sh
. Bulletin. Forests and forestry. PLATE XI. THE STRUCTURE OF WOOD. 1. Cross section of six-year old stem of White Pine showing (b) bark, (c) cambium, (ar) annual ring, (p) pith, and (rp) numerous small circular resin passages, natural size. 2. A resin passage with bounding epithelial cells, enlarged. 3. Non-porous wood of White Pine showing (spw) spring Avood, (sw) summer wood, (ar) annual ring, and (rp) resin passage, x 3. 4. Ring-porous wood of Chestnut, x 2. 5. King-porous wood of Red Oak, showing large medullary rays, x 3. 6. DifL'use-porous wood of Beech, x 4. 7. Block of Chestnut wood showing (cs) cross section, (rs) radial section, (ts) tangential section, (spw) spring wood, and (sw) summer wood, natural Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pennsylvania. Dept. of Forests and Waters. Harrisburg, Pa. : The Department
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