130

S

ALTS.

phlegm. Äs foon as the Salt is almoft diffolved,Lewis has advifed, to raife the retort out of thefand, ro ftop the procefs directly, and, if any Oilfwims on the top, to fkim it off. The liquor willthus be fully faturated, and prove always equal inftrength ; whereas, if the procefs is not now ftop-ped, the phlegm continuing to rife rauft render theliquor weaker. As this reftification is not fuffi-cient to render it pure, that is, clear, and of a grate-ful odour, the College have directed it to be repeat-ed a third time.

The Salt may be feparated from the Liquor, andpurified, in fome degree, by fublimation in a tallbody with a glafs head; removing the veffels as foonthe phlegm begins to rife : but it requires fartherdepuration, by fubliming it from a fmall portion ofAlkohol, or, as the College diredts, from chalk;

KALI VITRIOLATUM.

VlTRIOLATED KaLI.

Take of the Salt which remains after the dif-tillation of the nitrous Acid twopounds.

Diftilled