Pa al = 2 = 
PHYSICAL ann LITERARY. 181 
mon falt, and by diftilled vinegar; the 
neutral faline liquors thence produced 
having each their peculiar properties, 
TuaT which is made with the vitriolic 
acid may be condenfed into cryftals fi- 
milar in all refpects to Epfom fale. 
THAT which is made with the nitrous 
is of a yellow colour, and yields faline 
cryftals, which retain their form in a ve- 
ry dry air, but melt in a moift one. 
TuaT which is produced by means of 
fpirit of falt, yields no cryftals; and, if e- 
vaporated to drynefs, foon melts ia 
when expofed to the air. 
THAT which is obtained from the uni- 
on of diftilled vinegar with magnefia, af- 
fords no cryftals by evaporation, but is 
condenfed into a faline mafs, which, while 
warm, is extremely tough and vifcid, very 
much refembling a ftrong glue both in 
colour and confiitence, and becomes brit- 
tle when cold. 
By thefe experiments magnefia appears 
to bea fubftance very different from thofe 
of the calcarious clafs; under which I 
would be underftood to comprehend all 
thofe 
