PHYSICAL anp LITERARY. 177 
THERE is likewife a fpurious kind of 
Glauber falt, which yields plenty of mag- 
nefia, and feems to be no other than Epfom 
falt of fea water teduced to cryftals ofa 
larger fize. And common {alt alfo affords 
a {mall quantity of this powder ; becaufe, 
being feparated from the bittern by.one 
hafty cryftallization, only, it neceffarily 
contains a portion of that liquor. 
THOSE who would prepare a maguefia _ 
from Epfom falt, may ufe the following 
procefs. , 
DissOLve equal quantities of Epfom 
falt,and of pearl afhes feparately, in a fuf- 
ficient quantity of water; purify each fo- 
lution from its dregs, and mix them ac- 
curately together by violent agitation: 
Then make them juft to boil overa brifk 
fire. , : | 
App now to the mixture three or four 
times its quantity of hot water; after a 
little agitation, allow the magunefia to fet- 
tle to the bottom, and decant off as much 
F of the water as poflible. Pour on the 
~ fame quantity of cold water; and, -after 
4 fettling, decant it off in the fame manner, 
: VOL, II. Mee Repeat 
