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Sublimation

The process by which volatile solid substances are reduced to the case necessary, and should be avoided, espestate of vapor by heat, and again condensed cially in decoctions prepared from aromatic in solid form. It differs from ordinary distil- vegetables, or those abounding in extractive. lation only in being confined to dry solid The colleges, in such cases, direct the ingresubstances, and in the heat employed being, dients "to be boiled for a short time," or "for in general, much greater.

Calomel, corrosive 10 minutes," or they limit the time of boiling sublimate, and sal ammoniac, are thus pre- by stating the quantity that must be volatilpared.