224 Of the Gol © 



mer in the fulphur, the latter not only entangled 

 in the fulphur, but a)fo in another crude-earth. 

 In alum-jhiver there is no vitriol-acid at all, but it 

 is fetched either from the air, or generated at once 

 by fire and air, or by fire alone j tho' fire, with* 

 out air, can neither act inftrumentally nor materially ; 

 neither is the white earth of alum procurable from 

 the ore, nor therefore to be confidered as a genu- 

 ine production. 



The water, which is in a large quantity, both 

 in vitriol and alum, is neither in the pyrites nor 

 alum-ore, confidered in their mixtion, but is im- 

 parted to it either from the air, or by men r s hands. 

 The fame alfo holds of other vitriols, produced 

 from their own ©re alone •, though I cannot here 

 recoiled any but the white, and the fort from bif- 

 muth-ore and cobald, or from bifmuth itfelf, as 

 I have experienced. The former contains a white, 

 though coppery earth, which is neither from the 

 ore, nor from the accompanying fhivery, loamy, 

 and kneify minerals ; the latter, or the bifmuth- 

 cobaldifh, a green, though derivable from the 

 ground- earth of the fmalt-cobald-ore, as green 

 and blue are in nature near allied ; but the peach- 

 bloom colour, nay, the purple- red, as their beau- 

 tiful appearance deferves a peculiar regard, muff, 

 needs have their foundation in a peculiar confor- 

 mation of their earths. 



Thus in thefe productions, formed as much as 

 may be per fe, foreign matters, as air and fire, have 

 an influx j often the air alone, as in the fpontaneous 

 vitriolifation of pyrites ; often the fire alone, as in 

 the vitriolifation of calamy ; often both together, 

 as again in the vitriolifation of the pyrites, which 

 mufl firft pafs through the fire, and afterwards be 



expofed 



