. Bulletin. Forests and forestry -- United States. Fig. 12.—Wood and bark of the Western Yellow Pine. Tlie cut is a cross section ami would have been hor- izontal as tlie speci- men stood in the tree. Besides tlie division of the bark into scales Fig. 13.—Bark of the Western Yellow Pine. Outer surface, showing the scales made by the successive layers of cork cambium. branches of Birch and Cherry and many other trees. All plants, like all animals, breathe; and plants, like animals, breathe in oxygen and this picture shows i^j.^athc out carbouic acid gas. This twoor thedeepcracks ^ in the bark,
. Bulletin. Forests and forestry -- United States. Fig. 12.—Wood and bark of the Western Yellow Pine. Tlie cut is a cross section ami would have been hor- izontal as tlie speci- men stood in the tree. Besides tlie division of the bark into scales Fig. 13.—Bark of the Western Yellow Pine. Outer surface, showing the scales made by the successive layers of cork cambium. branches of Birch and Cherry and many other trees. All plants, like all animals, breathe; and plants, like animals, breathe in oxygen and this picture shows i^j.^athc out carbouic acid gas. This twoor thedeepcracks ^ in the bark, at thebot proccss of respiratiou or the breathing tomof which lenticels ^f ^^^ ^^.^^ o-^^^ ^^^ y^^^^ ^^ ^^^j UJght, are placed. ^ ^ *^ & ' but it is far less active than assimila- tion, which takes place only in the light. Consequently more carbonic acid gas is taken into the tree than is given out, and the surplus carbon remains to be used in 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. Division of Forestry. Washington : G. P. O.
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Keywords: ., bookpublisherwashingtongpo, booksubjectforestsandforestryunited
