Carbonate of soda, British alkali, or, as it is most commonly called among the manufacturers, " soda ash," is used as the practical source of alkali, and in a great measure it is also used as a ...

M. Mene, a French chemist, has just discovered that hydrate of alumina, prepared by decomposing alum with carbonate of soda, is a perfect substitute for animal charcoal in the decolorizing of liquids.