33* COMBINATION OF MERCURY 

 ' 



195 Ib. Troy, the greateft part of which concret- 

 ed into cryftals on the cooling of the folution. 



Spirit of wine, futuratcd with fal ammoniac, 

 of 20 degrees of temperature, will diflblve dou- 

 ble the quantity of corrolive mercury, or three- 

 fourths of its own weight. Being fct on lire, it 

 bums at iirfl with a flame of the ordinary colour; 

 but changes afterwards gradually to a yellow, 

 throws olFblue Harry fparks, and at length ex- 

 ploding is extinguifhcd *. 



5 xii. Difflhed in Mineral Adds, 



NEITHER arc the mineral acids avej-fe to an 

 union with corrofive mercury. The muriatic a- 

 cid diflblves it the moil readily ; and, if it is em- 

 ployed in confidepable quantity, no cryflals arc 

 formed, but when fparingly ufed, needle-like cry- 

 Aals are produced. 



The nitrous ucid occaiions vapours fuch as a- 

 rife from aqua regiuf. It is therefore to be con- 

 cluded, that this acid lias fei/.ed upon Ibme part 

 of the mercury. By the means of heat the 

 whole fait is diflblved ; and, on the evaporation 

 of the fluid, is formed into cryilals, and fullers 

 no alteration cither in weight or character {. 



With 



* Macquer in Mem. dc PAcaJ. dc Turin. 1766. 

 f Pott, dc Sale communi. 



