I58 PREPARATIONS OF IRON.

dered and wafhed as before. Let the wafhedpowder be dried.

FERRUM TARTARISATUM.

Tartarised Iron.

Take of Filings of Iron one pound.

Powdered Cryftals of Tartar twopounds.

Mix them with diftilled watcr into a thickpafte, which expofe to the air, in an openearthen vefTel, for eight days j then rub thematter, dried in a bath of fand, to the fineftpowder.

FERRUM VITRIOL ATUM.

VlTRIOLATED IrON.

Take of Filings of Iron,

Vitriolic Acid, of each, by weight,eight ounces.

Diftilled Water three pints.

Mix them in a glafs vefTel; and, when theefferveicence has ceafed, place the mixture

for