What is WOOD?

The wood from various species of trees varies in structure, specific gravity, elasticity, and strength. White pine has an average sp. gr. of o3Q, larch a sp. gr. of ojjf, and teak a sp. gr. of of>6. Wood consists of a mass of cells possessed of walls and containing a great variety of substances, such as cellulose, starch, resinous matters, essential oils, etc. All woods are liable to the attacks of fungus and the decomposition known as dry rot. More than seventy different kinds of moulds and fungi have been isolated fiom wood.or woodpulp. In spruce, hemlock, balsam, and aspen, the progress of decay is distinctly indicated by a decrease in the content of stable cellulose and increase in that of unstable cellulose. The distillation or carbonization of wood is conducted in castiron retorts, and is nowr a large industry, jielding four prime products in addition to the gases which are generated namely, charcoal, acctic acid, wood or methyl alcohol, and tar. Wood creosote is obtained from the redistillation of the tar.. The gases consist of about 15 per cent, hydrogen, 11 per cent, methane, 26 per cent, carbon dioxide, 41 per cent, carbon monoxide, and 7 per cent, hydrocarbons. Wood rich in rosin, such as that from pinetrees, yields also turpentine, and by pushing the distillation further, the rosin contained in the wood yields Rosin spirit distilling between 8o degrees and 150 degrees C. The following represents the results of a recently published analysis of oakwood: ordinary dried woods contain about 50 per cent, carbon, 6per cent, hydrogen, 40 to 42 per cent, oxygen, and 1 per cent, nitrogen. The following compilation of various wood dist Nation products produced in Canada in 1918 is published by the Canadian Bureau of Statistics:

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Definition of  WOOD