SALTS. 68. Muria. 215 



Muriated magnelia, Marine epfom. Kirnvan min. 2.^. 35. 



Muriat of magnefia. Thomf. chetn. 2. p. 326. 



Found in fait and other mineral fprings, and abounds in the 

 waters of the fea : its folution is precipitated by cauftic al- 

 kalies and not vifibly by the fulphuric : it very fpeedily deli- 

 quefces in the air, and when dried in a high temperature is 

 very cauftic : fpecific grnviry 1,601. contsinsacid 34. magj 

 nefia 41. water 25. Bergman* 



68. NIT ROM. Of a fliarp, bitterlfli, cooling 

 tafte: eafily foluble in water, and the folution 

 not made turbid by a mixture of foda: not ef- 

 fervefcing with diluted acids, but when faturated 

 with concentrated fulphuric acid emitting fharp' 

 fuiTocating red vapours : detonates violently 

 when made red hot and charcoal is thrown 

 upon it. 



nativum. Fixed, pure, not deliquefcing in the air, when diflblved 

 and flowly evaporated cryftallizing into 6-lided prifms 

 terminated at each end by an unequal 6 Tided pyramid. 



Zimmerman ^voyage a la nitriere. 1789* ^» 



Fort is del niiro miner ale. 1787. 8. 



Nitre. Kiyycan mineral. 2. />. 25. 



Nitre, Saltpeter. SchmeiJJer miner, l. p, 275. 



Nitrate of Potafs. Thomfon chem, 2. /. 401 . 



Found in Virginia, Spain, Sicily, India, Ferfia, and China i 

 white, of a cooling tafte and refifting putrefaftion : is very 

 brittle, and foluble in feven times its weight of vva^-er: 

 when expofed to a ftrong heat it melts, and congeals by 

 cooling into an opake mafs : detonates very violently with 

 combuftible bodies, particularly wiih phofphorii?. Its prin- 

 cipal ufe is in the compofition of Giin-pov:der, which is made 

 by mixing together 76 parts of nitre, 15 of charcoal, and 9 

 of fulphur: thefe ingredients are firft reduced to a Hne pow- 

 der, mixed well together, and reduced to a thick pafte wiih 

 water: after being a little dried, it is forced through a fieve 

 with fmall holes, and thus made into grains : thefe grai.ns 

 when properly dried, are put into barrels which turn on their 

 a%es, by which means the afperities are worn off and the fur- 

 faces made fmooth. Specific gravity 1,93^9. contains acid 

 31. potafs 61. water 8. Bergman » 



