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THE exact nature of the chemical components of wood and their relation to one another as they exist in the woody tissue is unknown. Wood is not a uniform mixture of cellulose, hemicelluloses, and lignin, since these substances are distributed in varying proportions in the different morphological parts of the tissue. Physical means of separating the cell wall components, such as extraction or solution and fractionation, are not possible. Chemical methods of isolating any of the constituents of wood are all drastic, and it is apparent that they result in isolated compounds which are altered from their original condition in the tissue. Chemical changes may be brought about in the •The photograph shows molding powders, films, lacquers, molded products, lacquer-finished articles, etc., prepared from nitrated sawdust.

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