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Benzole

In 1825, Faraday dis- plate, and heat them to a dull red, over a covered a peculiar liquid which was deposited charcoal fire. When the mass begins to burn, by condensation by ordinary coal-gas, and it must be frequently stirred; after which gave it the name of bicarburet of hydrogen. cool and dissolve in cold water, filter, and add Some years afterwards Mitscherlich, of Berlin, 20½ parts of dry sulphate of ammonia, and obtained the same liquid from benzoic acid, decant the clear from the precipitated sulthe clear from the precipitated suland proposed for it the name of benzine. phate of potassa. Concentrate at a heat beof potassa. Concentrate at a heat be- Faraday objected to this name, as too similar low 2120 , again decant, evaporate to dryness, to the distinctive names of the alkaloids, as and digest in boiling alcohol of 80%; crystals of urea will be deposited as the solution cools. (Liebig.)