*3 :

8 A L T S.

Diftilled Water two pints and auhalf.

ßurnout the fuperfluous acid, with aftrongfire, in an open veflel ; then boil it a little inthe water : ftrain the folution, and fet it byto cryflallize.

M

This Salt, the Sal Catharticus Glauben of theformer Difpenfatory, is in common ufe as a purga-tive, afting quickly and without griping ; and given^to adults from fix drams to ten.

NITRUM PURIFICATUM.

Purified Nitre,

Take of Nitre two pounds.

Diftilled Water four pints.

Boil the Nitre in the water tili it is diffol-ved: ftrain the folution, and fet it by to cryf-tallize.

R E M A R K.

The ufual method of evaporating folutions ofSaks, in order to their cryftalluatioh, tili a pellicle

appears