. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 1 .—Penetrations in Alpine Fir (Abies lasiocarpa) Heartwood. 1, piece No. 308, treated 30 minutes; 2, piece No. 307, treated 60 minutes; 3, piece No. 309, treated 120 minutes. This species contained no resin ducts or cells and is almost Fig. 2.—Douglas Fir (Pseudotsuga taxifolia) Treated in Penetrance Apparatus. The piece to the left is sapwood; that to the right is heartwood. The spots on the sapwood piece are treated resin ducts outside of the range of ordinary penetration. They show that the creo
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 1 .—Penetrations in Alpine Fir (Abies lasiocarpa) Heartwood. 1, piece No. 308, treated 30 minutes; 2, piece No. 307, treated 60 minutes; 3, piece No. 309, treated 120 minutes. This species contained no resin ducts or cells and is almost Fig. 2.—Douglas Fir (Pseudotsuga taxifolia) Treated in Penetrance Apparatus. The piece to the left is sapwood; that to the right is heartwood. The spots on the sapwood piece are treated resin ducts outside of the range of ordinary penetration. They show that the creosote must have penetrated radially and then longitudinally. Most of the spots are in the 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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