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^[[ [[centered]] [[double underline]] 9 [[/underline]] [[/centered]] ]] to illustrate chemistry and the chemical industries in the United States National Museum. The arrangement proposed is only provisional, to serve as a basis for systematic work, subject to such additions and modifications as experience may suggest. [[centered]] General Divisions. [[/centered]] A. Chemical Physics. B. Pure Chemistry. C. Applied Chemistry. D. Analytical Chemistry and Research. A. Chemical Physics. 1. Conditions of Matter. Solid, Liquid, Gas. 2. Crystallization. 3. Chemical Theory Atoms, Molecules, Volume, Weight. 4. Vapor Density 5. Heat Specific, Atomic, Molecular, Combination 6. Apparatus for Physical Research. B. Pure Chemistry 1. Elements