124

a A L T s,"

NATRON PRiEPARATUM,Fr~pared Natron.

Take of Bariila, powdered, two pounds,'Diiiilied Water onc gallon.

Boil the Bariila in four pints cf water forhalf an hour, and ftrain. Boil thepart whichremains after ftraining with the reft of thewater, and Hxain. Eyaporate the rnixed ii-quors to two pints, and fet them by for tightdays ; ftrain this liquoragr ; n ; and, after dueboiling, fet it by to cryftallize. DifTolve thecryftals in diftilled water, ftrain the folution^Iboiland fetit alide again tp cryftaflize,

AMMONIA PR^PARATA.

Prepared Ammoma.

Tajce pf Sal ammoniac, powdered, one;ppund.

Prepared Chalk two pounds.Mix and fublime.