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The mixture should be made in a wooden vessel, as that is preferable to one made of metal, which conducts the external heat to the materials with great rapidity; and when the substance to be cooled is placed in the mixture, the whole should be covered with a blanket, a piece of old woollen carpet doubled or some other non-conducting material, to prevent the access of the external warmth; the vessel used for icing wines should not be too large, that there may be no waste of the freezing mixture. This combination produces a degree of cold thirty degrees below freezing; and if the materials are bought of any of the wholesale druggists or dry salters, it is exceedingly economical. It is open, however, to the very great objection, that the spirit of salt is an exceedingly corrosive liquid, and of a pungent, disagreeable odour: this almost precludes its use for any purpose except that of icing wines.