. Report on the relation of railroads to forest supplies and forestry : together with appendices on the structure of some timber ties, their behavior, and the cause of their decay in the road bed, on wood preservation, on metal ties, and on the use of spark arresters . 401. Larix Americana, Michaux ; Tamarack. Radial Section x 100 Diameters. Report of Forestry Division, Department of 401. Larix Americana, Michaux ; Tamarack. Transverse Section x 100 Diameters. 51 1?AMABACK, Larix Americana, Rlichx, No. 401. The photomicrograph of the transverse section shows a zone of hard,dense,
. Report on the relation of railroads to forest supplies and forestry : together with appendices on the structure of some timber ties, their behavior, and the cause of their decay in the road bed, on wood preservation, on metal ties, and on the use of spark arresters . 401. Larix Americana, Michaux ; Tamarack. Radial Section x 100 Diameters. Report of Forestry Division, Department of 401. Larix Americana, Michaux ; Tamarack. Transverse Section x 100 Diameters. 51 1?AMABACK, Larix Americana, Rlichx, No. 401. The photomicrograph of the transverse section shows a zone of hard,dense, nearly solid tracheids, which form from one-sixth to one third ofthe annual ring, and, like those of Pinus palustrtSj have a sharp line ofdemarcation where the two classes join in the ring. These two speciesof trees attain their greatest development in opposite portions of thecountry: the Tamarack in the North, and the Yellow Pine in theSouth. The resin-canals in the former are confined to the zone ofthick-walled tracheids, and are usually near the outer portion of thering. The cells which form the exterior portion of the canal are muchthicker and firmer than those in Pinus palustris, and the area of thecanal is also much less. Generally two canals are in close proximity,but without any apparent connection. The thin-walled tracheids in different trees vary somewhat in size,ranging from 0.
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Keywords: ., boo, bookcentury1800, booksubjectforestsandforestry, bookyear1887
