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The anhydride of ortho-phthalic acid is obtained very easily by means of the usual methods for the preparation of anhydrides. It is also obtained by simply heating the acid. No anhydrides of the isomeric meta-

This compound is insoluble in most organic solvents. By heating with nitrobenzene or acetophenone, some of it dissolves, giving a red solution, but on cooling only a very small amount separates out. It does not melt a t 300'. Heated with sodium hydroxide solution, it gives the odor of benzaldehyde. Concentrated sulphuric acid dissolves it, giving a red solution. Work upoii ethyl pyroniucylacetate and its pyrazolone derivatives will be continued in this laboratory. THE CONSTITUTION OF I-PHENYL-~,~-NAPHTHALENE-DICARBOXYLIC ACID.

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