21-8 SALTS. 70. Amaium. 



colour is fcldom white, but of a grey, yellowifh-grey. or 

 lemon-colour: it is alfo found in a ftalaftitical form, or in- 

 veiling lavas, or in an earthy ilate with little or no luftre : 

 its cryftals are generally fm-jll 6 fided prifins whofe planes are 

 unequal, terminated by 6- Tided pyramid?: it is foluble in 

 twice its weight cf cold water, and flowly attrs6ts moiilure 

 when expofed to the air: when heated it firft decrepitates, 

 then melts, and in clofe vefTcls fublime* : contains acid 

 I 54j66. ammonia 14,24, water 31,10. Kirivan. 



70. AMARUM. Of a bitter tafte: eafiiy foluble 

 in water, and the frjlution becoming milky by a 

 mixture of fod a : eafily melting in heat, but nei- 

 ther detonating or decrepitating. 



gemlnum. Foaming in the fire, when difTolved and evaporated cryftal- 



lizing into 4-fided prifma terminating each fide in a 

 4-fided pyramid, and which wither when expofed to 

 the air. 

 Natrum epfamenfc. Syst. nat. xii. 3. />. 89. «. 3. 

 Sal neutr. compofit. Wail fy ft. 2. p.ji^ n. 2^ 

 Epfom fait. Kir^juan miner. 2. p. 13. 

 Epfom fait, Biitfr fait. SchmeiJJ'er miner, I. 269, 

 Sulphat of magnefia. Thom/on chem. 2~ p'ZS7' 

 Found in many mineral waters of Britain and other parts, at 

 Jena on gypfum, in Snvitzerlami in a powdery flate, fome- 

 time'^ in a ftate of inciuftation covering the furface of the 

 earth, in fea-water it abounds and frequently renders the fait 

 prepared from it bitter: its cryftals are 4-fided prifms whofe 

 faces are equal, ending in 4-lided pyramids or 2fided fum- 

 mits : before the blowpipe it melts with difficulty into an 

 opake glaffy globule. Its ufe is well known as a purgative; 

 and the magnefia of the fliops is prepared from it, by diUblv- 

 ing it in water, and precipitating the magnefia contained in 

 it by means of alkalies. Specific gravity 1,66. contains acid 

 33. magnefia 19. water 48. Bergman, 



muriaticum. Deliqnefcing in the atraofphere, emitting acrid cinereous 

 vapours of a difagreeable odour when fulphuric acid is 

 poured on ir, or it is expofed to a confiderable degree 

 of heat. 

 Found plentifully in faU-watersj fprings and lakes, and con- 

 verts nitric acids into nitro-niuriatic acid : it is alfo foluble 

 in alcohol. 



