33S ESSAYS and OBSERVATIONS 



after it has dilTolved fufficiently of two 

 or more of tbefe falts, it will, even then, 

 difTolve feme more fea fait, and flill 

 more of the Epfom or Glauber's fait. 

 Hence, by the way, we find fuch a varie- 

 ty of mineral or medicinal waters, impreg- 

 nated in various proportions, with diffe- 

 rent falts, vitriols, metals, earths, &c. 

 The acid of fea fait which has diflbl- 

 ved quick-filver, and chryftallized with 

 it in the fublimation of corrofive mer- 

 cury, will diflblve the metallic or reguline 

 part of antimony into a liquor, called 

 butyrum antimonii ; and this will after* 

 wards difTolve gold. Diffolve filver in a- 

 qua fortis^ when the folution is finilhed, 

 add to it fome crude fait ammoniac, in 

 powder, and fet the veffel in hot fand j 

 the filver will all fall to the bottom : Then 

 pour the clear liquor into another glafs , 

 this will be found a good aqua regia fit 

 to difTolve gold, regulus antimonii^ 8cc. 

 There is another noted experiment which 

 evidently illuftrates and confirms the re- 

 mark. If fine copelled filver is difTol- 

 ved in proof aqua fortls, and the folution 



is 



