_The usual mode of cooling wine and other liquids by ice_, is to surround the bottle, or other vessel in which the liquor is contained, entirely with ice, observing that the hottest part of the wine is always at the top of the bottle, but that if the top is chilled faster than the bottom, the cold wine descends, and that which is still warm rises and takes its place. As, therefore, the wine is liable to be set in motion by the process of cooling, it is best to decant it before it is put into the refrigerator, as otherwise there will be danger of disturbing the sediment of white wine and the crust of port. When ice is perfectly clean and clear, like that of the Wenham Lake, it is sometimes broken into small pieces, and put into the liquid which is to be cooled; but this could not be done with the ice collected from the dirty ponds near London. When it is wished to cool wine rapidly, it is only necessary to put it into a thin glass bottle, and to wet the outside with ether; as cold is produced by rapid evaporation sooner than in any other manner, wine-coolers are formed on this principle. _A freezing mixture_ for cooling wine, and for freezing ice-creams, may be formed by mixing five parts of sal ammoniac with five parts of nitre and sixteen of water. A mixture of snow or pounded ice and salt produces a most intense cold, but it is only while the salt is melting the ice or snow that the cold is felt. Muriate of lime, mixed with snow, produces a still greater degree of cold. Several other mixtures may be used for freezing; but those producing the most intense cold are mixtures of nearly equal parts of sulphate of soda with nitrous or sulphuric acid, the sulphate predominating. Eight parts of sulphate of soda, mixed with five parts of muriatic acid, will produce a cold equal to zero. When any liquid is to be frozen by these mixtures, the bottle containing the liquid is put into a wooden vessel containing the mixture; and if the cold is to be very intense, the outer vessel may be placed on a flat piece of cork in a much larger empty vessel, the whole being covered with a woollen cloth. Water freezes soonest when it has been boiled, and forms the most compact and beautiful ice.