NOTES AND CORRESPONDENCE: The Invention of Celluloid; Symposium on the Recovery of Wool Grease; Guaranteed Chemicals; Toxicity of Various Wood Preservatives—A Note; Note on Meaning of “Impurities” and How They Should be Determined in Grease, Tallow, Etc.; Test of Gila River Natural Aluminum Sulfate in Water Purification; The Effects of the Ensilage Process on the Solubility and Metabolism of Floats; Mine Inspectors Institute of the U. S.; Ninth International Congress of Applied Chemistry; Van't Hoff Fund for the Endowment of Research in Pure and Applied Chemistry; American Chemical Society—Annual Meeting; A. C. S. Directory, 1914; Industrial Chemists and Chemical Engineers—A. C. S.—Committee on Alum Specifications—Correction and Notice; The Differentiation of Natural and Oil Asphalts—Correction

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