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Preparations of Zinc.

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White Vitriol, or vitriolated Zinc, containsfomctimes a flight impregnation of copper, andmore of a ferruginous matter, it therefore wants fomedepuration. lt is one of the quickeft in Opera-tion of thofe emetics which äre efteemed fafe, indofes, to adults, from fifceen grains to a fcrupl?or half a dram.

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