324 ESSAYS ann OBSERVATIONS 
alefce into a dry folid falt, nor will the vo- 
latile alcali feparate from the acid, by a fim- 
ple diftillation, but they rife together. I put 
eight ounces of this {pirit into a bolt-head ; 
‘and, adding half an ounce of dry falt of 
tartar, I prefently fitted a capital and recei- 
ver to the body, luted the joinings, and fet 
the veffels in a fand heat; in a little time a 
white volatile falt fublimed into the capital, 
which was foon wafhed down by a watery 
vapour into the receiver. This liquor being 
tried, was found equally ftrong, pungent, 
clear and volatile, as the beft {pirit of fal- 
ammoniac: the faline matter left in the bo- 
dy was of a greyifh colour, foft and greafy 
to the touch, and would hardly dry or chry- 
ftallize, refembling tartarus regeneratus. 
I need not confirm this by any further ex- 
periment, becaufe it is known to every body, 
that the volatile falt and fpirit of fal-ammo- 
niac are procured by adding a fixt alcaline 
falt to the crude fal-ammoniac: now, as we 
can prepare an extemporaneous or artificial 
falt, by impregnating the volatile falt or fpi- 
rit of fa!-ammoniac with the fpirit of fea falt ; 
we have noreafon todoubt, but, by means 
of 
