[ ^53 ] 



This folution is alfo precipitable by mild alkalis, whether 

 fixed or volatile, and apparently fo by the fixed cauftic vegetable 

 alkali ; but the cauftic volatile produced only a flight cloud, pro- 

 ceeding, as I imagine, from its not being perfedlly cauftic. 



Mild calx caufed alfo a precipitation of Stronthian from this 

 folution, but mild barytes none. 



Common lime-water produced a precipitate in this folution 

 from the caufes already mentioned ; but barytic lime-water caufed 

 a copious precipitate. 



All neutral falts, formed by the vitriolic acid united to any 

 bafis, fuch as the folutions of tartar vitriolate, glauber, vitriolic 

 ammoniac, felenite, epfom, alum, and of the vitriols of zinc, 

 lead, mercury, tin, bifmuth, rcgulus of antimony, produced copi- 

 ous white precipitates, that of iron a brown. 



But neither iron, copper, tin or lime, in their metallic forms, , 

 caufed any change in our folution, at leaft in a ftiort time. This 

 folution, being evaporated nearly to -i- its bulk, fhot into cryftals 

 foluble in their own weight of w'ater of the temperature of. 

 68°. At 78° or a ftill higher heat they efilorefce. 



To the Nitrous Acid. . 



This ftone is fcarce at all attacked by nitrous acid whofe 

 fpecific gravity is 1,4, but if to this acid half its weight of 



water . 



