lo account: of a MINERAL 



properties of Strontitic water above recounted. In acids the cry- 

 ftals are diflblved without effervefcence, and there refult the fame 

 products as when the native mineral is employed. 



20. When I firfl obferved the Strontites in a ftate of cryftal- 

 lization, I imagined it was the only earth that could, in confe- 

 quence of its greater folubility in warm than in cold water, be 

 obtained in this form, and I noted this property as charadler- 

 iftic of it. I have however been fo fortunate as likewife to pro- 

 cure cryftals of barytes. 



Habitudes of Strontian Mineral with Acids. 



With Sulphuric Acid, 



21. When a folid piece of fpar is dropped into fulphuric 

 acid, a few air bubbles arife, but thefe foon ceafe, and the mafs 

 remains undifTolved. If, however, the fpar be firfl reduced in- 

 to fine powder, and then added to the acid in fmall portions, 

 an effervefcence takes place, a combination is formed, and the 

 compound falls to the bottom. The acid, in very minute quan- 

 tity, renders Strontitic water turbid, which arifes from the forma- 

 tion of the fulphate. 



22. The fulphate of Strontites is in the form of a white 

 powder. It has no tafte, arid very little folubility in water. I 

 boiled one grain for fome minutes in four ounces of diftilled 

 water, half a grain was diffolved. The folution became tur- 

 bid on the addition of the carbonate of potafs, of barytic wa- 

 ter, and of muriate of barytes. Sulphuric acid, when aided 

 by heat, readily diflblves it. An effufion of water caules the 

 acid to part with the earthy fait. 



With 



