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Precipitated Sulphur

Sublimed sulphur, 1 part; dry slacked lime, 2 parts; water, 25 parts; boil for 2 or 3 hours, dilute with 25 parts more water, filter, precipitate by muriatic tic acid, and drain; well wash, and dry the precipitate. Resembles sublimed sulphur in its general properties, but is much paler, and in a finer state of division. 4352. Το Purify Precipitated Sulphur. The precipitated sulphur of the shops contains about two-thirds of its weight of sulphate of lime (plaster of Paris), owing to the substitution of sulphuric for muriatic acid in its preparation. This fraud is detected by heating a little of the suspected sample in an iron spoon or shovel, when the sulphur is capitals or domes-lined with rice straw.

As the water boils, the camphor is volatilized along with the steam, and condenses on the straw , under the form of greyish granulations.

In this state it is collected and transported to Europe, when it undergoes the process of refining into white camphor. To refine it, 100 parts of crude camphor are mixed with 2 parts cach of quicklime and animal charcoal, and placed in a thin globular glass vessel sunk in a sand-bath. The heat is then cautiously applied, and the vessel gradually and carefully carefully raised out of the sand as the subgoes on. the whole is allowed to cool. If the proces When this is completed, be conducted too slowly , or at a heat under 375° Fahr., the product will be flaky, and consequently unsaleable, without remelting or subliming subliming. phor may be beaten in a mortar for some