34^ ESSAYS AND OBSERVATIONS 



fhall mention a few examples, in which 

 the greatefl variety obtains. Pure filver 

 being diHolved in good (iqua fortis, and 

 the lolution diftributed into fix or eight 

 glafles "we may make as many precipita- 

 tions by different precipitants ; for folu- 

 tions of fea fait and crude fait ammoniac, 

 fpirits of fea fait, vitriol and fait ammo- 

 niac, a fixt alcaline fait or its lee, and a 

 piece of copper, will, each of them fepa- 

 rately, make a precipitation of the filr 

 ver. 



QuicK-siLVER,difrolved in aquafortis^ 

 may be precipitated by a folution of fea 

 fait, by a folution of crude fait ammoni- 

 ac, by frefh urine, by fpirit of fait ammo- 

 niac, by ol. tart. p. d. and by zinc. 



Regulus of antimony, dilTolved in aqua 

 rcgia, will be precipitated by plain water, 

 by a folution of falt-petre, by fpirit of ni- 

 tre, and, by the alcaline liquors, fixt an^ 

 volatile. 



VI. The matters precipitated from the; 

 fame folution, by different precipitations, 

 differ from one another in feveral remark- 

 able qualities. 



When 



