2i6 SALTS. 69. Mirabile. 



humoium. Fixed, not deliquefcing in the air, when difl'olved and 

 f!ow!y evaporated cryftalJizinsj into 6-fided prifms 

 terminating at each end in a 6-lided unequal pyramid, 

 efflorefcing, mixed with mould or chalk. 



NitruiTJ huniofum, Syfl. nat.yXi. 3. p, 84. «. i. 



Niiruni mineraliraium. Wall fyii 2. p. 45:, n. I. 



Found, generally in a Hate of white efflorefcence, on molft old 

 walls which are but little expofed to the adion of the fun and 

 winds, as in wells, grottos, ^^'c. efpeciaily thofe which face 

 towards the fea. 



cuhicmn. Fixed, when dilfolved and evaporated concreting into 

 rhombic cryllals. 

 Nawwerk Chem. annal. I 784. 2. ^. 314. 



Found, though rarely, in caves with the laft, efflorefcing from 

 the nioill iidcs of wdlls. 



fammans^ Evaporating in fmoke when thrown on red hot coals, emit- 

 ting an alkaline odour when rubbed together with 

 quicklime, deliquefcing in the air. 



Nitrum iemivolatile, Cronlh miner, 38, 



Found with the Nitrum humofum. 



6^, MIRiVBILE. Of a bitter tafte; not eafily 

 loluble in cold water, and the Iblution not nnade 

 turbid by a mixture of foda: not efFervefcing 

 with any acid: expofed to a white heat with 

 powdered charcoal producing an alkaline ful- 

 phur. 



leminum. Of a cooling tafte, eafily melting in the fire, when diflblv- 

 ed and ilowly evaporated cryftallizing into very tranf- 

 parent unequally 6- Tided prifms which moulder in the 

 air. 

 Natrum fontan, faturat. SyJ}^ nat, xii 3./>. 89. ». 3.d* 

 Sal neutrum compofit. Wall.fyst. 2. p. 70. «. i. 

 GIauber*s fait. Berkenh. outl. 2^3. 

 Glauber's faJt. Kir^-<van miner, 2. />. 9. 

 sulphate of foda. SchmeiJ/er mineral. I, p» 267. 

 Suipnat of foda. Thomfon chem. 2. p. 349. 



Found in many mineral waters of Britain and other parts of 

 Europe^ fometimes dry, rarely in a cryflallized ftate, fome- 

 times in a llate^of white efflorefcence on moid walls, in vaft 

 quantities under the furface of the earth in the neighbourhood 

 of /J/tracan, and in fummer at the bottom of lakes; it is 



