i66 A SYSTEM OF 



9. It is difiblved, in forma ficca, by the liver 

 of fulphur, and alio fomewhat by the glafs 

 of bifmuth. 



10. It is not carried away by the antimony 

 during the volatilifation of that iemi-metal, 

 and is therefore conveniently feparated 

 from other metals by the help or crude 

 antimony \ in which proceis the other me- 

 tals are partly made volatile, and fly off 

 with the antimony,- and partly unite with 

 the fulphur, to which the gold has no at- 

 traction, unkfs by means of fbme uniting 

 body* or by a long digeftion. 



Ii. The phofphorus is laid to have ingrefs 

 into gold. 



12. If mixed with a lefs portion of filver, 

 platina, copper, iron, and zinc, it preserves 

 tolerably well its ductility j but, 



13. When mixed with tin it becomes very 

 brittle ;. and it attracts likewife the fmoke 

 of that metal, fo as to be fpoiled, if melted 

 in an hearth where tin has been lately 

 melted : And this is perhaps the reafon 

 why gold becomes brittle, and of a paler 

 colour, when melted in a new black lead 

 crucible (Sect, cliv.) 



$4, It requires a ftrong heat before it melts, 

 nearly as much, or a little more than 

 copper 



15. Jt mixes or amalgamates readily with 

 quickfilver. 



16. It is not difiblved by the glafs of lead, 

 and therefore remains on the cuppel. 



In confequence of thefe its principal 

 qualities, it feems as if it could never be 

 found in the earth but in a native or pure 



ftate i 



