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determination oe organic suleur 1033 minutes in acetic anhydride. The acetylated product was obtained by precipitating with water. It dried to a semi-crystalline, reddish powder, insoluble in alkalies.Condensation of 9,10-Diphenic-ketone-4-carboxylic Acid with Resorcinol, Formation of 2 ',7 '-Dihydroxy-.s£i>o (9-fluorene-9 -xanthene) 4-carboxylic Acid Fifteen g. of the ketonic acid, 16 g. of resorcinol and 25 g. of fused zinc chloride8 were heated 5 hours at 115-120 °. The melt was boiled with hydrochloric acid, dissolved in dil. caustic soda solution and precipitated with hydrochloric acid. The product so obtained was not so sticky as that from the anhydride. It was dissolved in boiling alcohol and reprecipitated with water. The resinous solid was dried at 105°and powdered. Its alkaline solution was brownish-yellow and had a green fluorescence; 22.17% of silver was found in the silver salt. A sample was acetylated at 135°for 2 hours, as in the case of the condensation product from the diphenic anhydride. The product was soluble in alkali. SummaryDiphenic anhydride has been condensed with resorcinol to form a compound similar in structure and properties to fluorescein. The condensation product was brominated to give a compound analagous to eosin.

Vol. 47 tion of 0.34 g. of recrystallized dibutyldixanthyl in 25 cc. of ether was filtered into a small flask which was then closed with a calcium chloride tube and allowed to remain overnight. By morning, a few colorless crystals of peroxide had formed. Shaking separated more crystals, smaller in size. After another day, the light yellow ether solution was decanted from the crystals which were then washed with a small amount of ether and dried; yield 0.19 g., or 52%; m. p., 182-183.5°, with evolution of gas at 183.5°.Evaporation of the ether solution gave 0.02 g. of inferior product melting at 158-160°.The peroxide was found to be quite stable in air, its melting point not changing after a week's exposure.