the calcined ashes of a plant; of a similar nature with our pot-ashes or pearl-ashes. It is brought from the Levant and Syria; and in the glass trade it is always to be preferred to any other ashes. The barilla, or pot-ashes of Spain, yield more pure salt than the pulverine of the Levant, but the glass made with it has always some blue tinge: that made with the pulverine is perfectly white, which ought always to be used for the finest crystal.