Nitro-muriatic acid has been recommended for this purpose, but, without enterin; into the obvious demeiits of this agent, which JS neither fitted for general use, nor suited for cambric or fine linen, Boettger proposes a concentrated solution of Liebig's cyanide of potassium as a sure and harmless means of removing the stain of marking-ink from linen textures. In the preparation ot this salt, it is essential that the ferrocyanide be as lree as possible irom the sulphate of potash, to prevent the generation of a combination with sulphur during the process of heating, which would entirely defeat the object. Names and marks on linen and wearing apparel, of many years standing, may be totally and effectually removed from the finest cambric, even without the slightest injury to the texture, by rubbing the marking gently with a rather concentrated solution of oxalate of potash. The red and black stains produced on the skin, by the solution of the salts of silver and gold, may be perfectly removed by a solution of the abov e mentioned salt. It is necessary, however, that the skin should be intact, as this salt produces ill effects if applied to open sores.