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PRiEPARATIONES

SIMPLICIORES.

THE MORE SIMPLEP r E P A R A T I O N S.

QUORÜNDÜM IN AQUA NON SOLÜB1LIÜM

PRjEPARATlO.The PREPARATION of some Substa*-

CES NOT SOLÜBLE IN WATER.

TlEAT thefe fubftances firft in a mortar toD powder ; then, pouring on a httlewater, levigatc it npon a hard and pohflied.but not calcareous, ftone, that ,t may be^de as fine as paffiblc. Dry thxs P-derU ponblotting-paperlaid on chalk, and fe titin a warm, or at leaft dry, place tor fbmedays.

F 4 In