t m 3 



Calcum, as more confiftent with the new chemical 

 nomenclature ; but further experiments are re- 

 quifite to determine the truth of thofe already 

 made, as they are doubted by fome eminent che- 

 mifts. 



I. Ductile. 



A. PLATINA, Plata Silver, or Platina de 

 Pinto ; found only in Spanifh America in fmall 

 grains among the gold mines there ; intro- 

 duced into England in the year 1749 It is ufu- 

 ally united with iron, and in it's crude ftate is 18 

 times heavier than water, and when pure is hea- 

 vier than gold, it's fpecific gravity being 2i~. 

 With a ftrong white heat it's parts will adhere 

 jtogether by hammering. The beft folvent is 

 aqua regia, compofed of equal parts of the ni- 

 trous and marine acids. 



B. GOLD is a yellow metal, 19 times heavier 

 than water-, unalterable by air, or fire; foluble 

 in aqua regia, compofed of three parts of nitrous 

 and one of marine acid, and may be precipitated 

 by various fubftances ; lime and magnefia pre- 

 cipitate it in the form of a yellow powder; the 

 nut-gall precipitates it of a reddifh colour ; the 

 volatile alkali of a brown, yellow, or orange co- 

 lour, known by the name of fulminating gold, 

 and this powder weighs a fourth more than the 

 gold^made ufe of; liver of fulphur precipitates 



