All the articles which have acid mixed with them are extremely liable to grain, when they are useless for any purpose whatever, except, to .sell for broken pieces, as they cannot be boiled again unless the acid is extracted The method of doing this is at present not generally known in the trade, and it is kept by many that are in possession of it as a great secret. A sovereign is often paid for this recipe alone. However great the secret may be considered, it is only returning to the first principle in the manufacture of sugar. When the juice is expressed from the canes, it contains a considerable quantity of oxalic acid, which must be destroyed before it will granulate into sugar: for this purpose lime is employed, which has the desired effect; so will it also in this case, but chalk or whitening is most generally used. First dissolve your acid sugar in water; when this is thoroughly accomplished, mix in a sufficient quantity of either of these alkalies in powder to cause a strong effervescence; after it has subsided, pass it through a flannel bag, according to the directions for clarifying sugar. The filtered syrup will be fit to use for any purpose, and may be boiled again to the crack or caramel degrees as well as if no acid had ever been mixed with it. Let the pan it is dissolved in be capable of containing as much again as there is in it, or the effervescence will flow over.