hydrochloric and sulfuric acid solutions promoted furfural formation at distillation temperatures, the yield being dependent on the acid concentration, the temperature and on the duration of the distillation. This is a first order reaction.The behavior of mineral acids at distillation temperatures on furfural, arabinose, rhamnose, tetramethylene glycol, ketoxylose, xylonic acid, glycerol and erythritol was investigated. In the last four cases there was little or no reaction. The significance of these results on the mechanism of the pentose-to-furfural reaction has been discussed. Evanston, Illinois

During a study of synthetic laxatives it became necessary to obtain a supply of phenolphthalein (4',4"-dihydroxydiphenylphthalide) entirely free from the by-products which result during the manufacture of this substance. Certain of these by-products-presumably some type of anthraquinoneare extremely potent cathartics and yellow phenolphthalein, that is, phenolphthalein which has not been subjected to a thorough purification process and which is contaminated with a small quantity of a yellow, alkali-soluble, resinous material, is used extensively as a laxative.2 Furthermore, we wished to obtain a sample of isophenolphthalein (2,,4'/-

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