PartlV. of the Bank i if 5 



ra£teriftick of any Metall or Mineral 

 muft be fought for in the conftituent 

 "^Matter of it: and it muft be firft: 

 ^brought down to that before any cer- 

 tain Judgment can be given. And 

 when that is once done, and the leve- 

 ral kinds feparated and extrafled each 

 from the other, an homogeneous Mafs 

 of one kind is cafily diftinguiftiable 

 from any other : Gold from Iron : Sul- 

 phur from Alum : and fo of the reft* 

 But without this^ fo various are their 

 Intermixtures, and fb different the Face 

 and Appearance of each, becaufe of that 

 Variety, that foarcely any thing can 

 be certainly determined ot the particu- 

 lar Contents of any fingle Mafs of Ore 

 ^ fcy meer Infpeftion. I know that by 

 Experience and Converfation with thefe 

 Bodies, in any Place or Mine, a Man 

 may be enabled to give a near Conje- 

 ^ €lure at the Metallick or Mineral la- 

 ^l^redients of any Mafs commonly found 

 ^^^here ; but this meerly becaufe he hath 

 ^ '%efore made tryal of other like Maffes, 

 y^pjand thereby learned what it is they 

 ^^^tontain. But if he remove to another 

 ^^place, though perhaps very little di* 

 X^ftant, 'tis ten to one but he meets with 

 different. a face of Things, that he'll 



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