SALTS. 68. Muria. 
2t5 
Muriated raagnefia, Marine epfom. Kinua/t min. 2. p. 35. 
Muriat of magnefia. nom/. chem. 2. p. 326. 
Found in fait and other mineral fprings, and abounds in the 
waters of the fea : its folution is precipitated fay caiillic al- 
kahes and not vifibly by the fulphuric : it very fpeedilv deli- 
quefees in the air, and when dried in a high temperature is 
very cauftic: fpecific gravity 1,601. contains acid 34, mag. 
nefia 41. water 25. Bergman. 
68. NITRUM. of a (liarp, bitteiifli, cooling 
tafte: eafily Ibluble in water, and the folution 
not made turbid by a mixture of foda: not ef- 
fervefeing with diluted acids, but when laturated 
with concentrated fulphuric at id emitting Qiarp 
fuffbeating red vapours ; detonates violently 
when made red hot and charcoal is thrown 
upon it. 
Fixed, pure, not deliquefclng in the air, when diffoived 
and llowly evaporated cryftallizing into h-fided prifms 
terminated at each end by an unequal 6-ilded pyramid. 
‘Zimmerman moyage a la nitriere. 17 ^ 9 ' 
Fortis del nitro mineraie, 17 ® 7 " 
Nitre. Kimvan mineral 2. p. 25. 
Nitre, SHl'peter. Schmeijjcr miner , p. 275. 
Nitrate of Potafs. Fhomfon chem. z. 401. 
Found in Virginia, Spain,, Sicily, India, Perfia, and China; 
white, of a cooling tafte and refilling putrefaaion : is »ery 
brittle, and folublc in feven times its weight of water; 
when expofed to a ftrong heat it melts, and congeals by- 
cooling into an opake mafs : detonates very violently tvith 
combuftible bodies, particularly with phofphorus. ^ Us prin- 
cipal ufe is in the compofition of Gun powder, which is made 
by mixing together 76 parts of nitre, 15 of charcoal, and 9 
of fulphur: thefe ingredients are firft reduced to a fine pow- 
der, mixed well together, and leduced to a thick pafte with 
water: after being a little dried, it f. forced tbroiigh a fiev: 
with fmall holes, and thus made into grains : thefe grains 
when properly dried, are put into barrels which turn on their 
axes, by which means the afperities are worn oft and the liir- 
faces made fmooth. Specific gravity 1,9369. contains acii 
31. potafs 61. water 8, Bergmari, 
