2i8 
SALTS. JO. Amaruin. 
colcur is feldom white, but of a grcv, ycliowifli.gre)'; 
lemon-colour: it is alfo found in a ftaladlitical form, cr 
veiling lavas, or in an earthy ftate with little or no lulb^’ 
its cryftals are generally fmall 6 fided prifms whofe planes af* 
unc.jual, terminated by 6-lided pyramids : it is loluble >” 
twice its Weight of cold water, and Hovvly attrafls moillut^ 
when expofed to the air: when heated it firll decrepitate®’ 
then melts, and in clofe velTcls fublimcs: contains at:id 
54,66. ammonia 14,24, water 31,10. Kirnuav. 
70. AMARUM. Of a bitter tafte: eafiiy fokiblc 
in water, and the folucion becoming milky by ® 
mixture of ioda : eafily melting in heat, but nei- 
ther detonating or decrepitating. 
genuinum.- Roaming rn the fire, when dilTolved and evaporated cryftal- 
lizing into 4-fided prifms terminating each fide in * 
4-fided pyramid, and which wither when expofed t® 
the air. 
Natrum epfamenfe. Syit. nat. xii. 3. p. 8g. n. 3, 
Sal neutr. compofit. Wall fy ft. z. p.J\. n. 2. 
Epfom fait. Kirtwan miner. 2. p. 13. 
Epfom fait, Bitter fait. Schmeijfer miner. 1. 26c). 
Sulphat of magnefia. Thomfon ehem. z /. 357. 
Found in many mineral waters of Britain and other parts, 
Jena on gypfum, in Snxiitxcrland in a powdery ftate, fontf' 
times in a ftate of inciulhtion covering the furfacc of ib® 
earth, in fea-water it abounds and frequently renders the la[f 
prepared from it bitter: its cryftals are 4-lided prifms vvhol® 
faces are equal, ending in 4 licied pyramids or z-fided futn- 
mits : before the blowpipe it melts with difficulty into an 
opake glafly globule. Its ufe is well known as a purgative; 
and the magnefia of the fliops is prepared from it, by diflblv- 
ing it in water, and precipitating the magnefia contained i® 
it by meam of alkalies. Specific gravity t,66. contains aciu 
33. magnefia 19. water 48. Bergman, 
muriaticum. Deliquefcing in the atmofphere, emitting acrid cinereoip 
vapours of a difagreeable odour when fulphuric acid t® 
poured on it, or it is expofed to a confiderable degt®^ 
of heat. 
bound plentifully in falt-wateTs, fprings and lakes, and con- 
verts nitric acids into nitro-muriatic acid; it is alfo iolub'® 
in alcohol. 
