the removal of stain from the vegetative cells with a decolorizing agent; and counterstaining the vegetative cells with a dye of a different colour. The same treatment is used to differentiate ...

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.