. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 1.—Penetrations in Jack Pine (Pinus divaricata) Heartwood. 1, piece No. 296, treated 30 minutes; 2, piece No. 298, treated 60 minutes; 3, piece No. 297, treated 120 minutes. The structure surrounding the resin ducts was easily penetrated, allowing the heartwood to be satisfactorily treated. Note the well-defined radial penetration which fol- lowed the radial ducts toward the Fig. 2.—Penetrations in Tamarack (Larix laricina) Heartwood. 1, piece No. 312, treated 30 minutes; 2, piece No. 313, treated 00 minute
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 1.—Penetrations in Jack Pine (Pinus divaricata) Heartwood. 1, piece No. 296, treated 30 minutes; 2, piece No. 298, treated 60 minutes; 3, piece No. 297, treated 120 minutes. The structure surrounding the resin ducts was easily penetrated, allowing the heartwood to be satisfactorily treated. Note the well-defined radial penetration which fol- lowed the radial ducts toward the Fig. 2.—Penetrations in Tamarack (Larix laricina) Heartwood. 1, piece No. 312, treated 30 minutes; 2, piece No. 313, treated 00 minutes: 3, piece No. 311, treated 120 minutes. This is a good example of a species containing resin ducts that may be easily impregnated, but in which the nonresin structure is almost impenetrable. Note the absence of radial or tangential 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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