82. Whether or no 3 having once brought the Ore to fu- 
fion 3 they melt all the Metal it fel£ 3 to have it the more pure ? 
And 3 if they do 3 with what circumftances they make the fufion? 
83. Whether they have any Signs 3 whereby to know whe- 
ther the Fufion have been well or ill perform’d 3 and the Metal 
have obtain’d the perfe&ion 3 to be expe&ed from fuch Ore 3 
melted in iiicha Furnace ? 
84. Whether they obferve any great difference in the 
goodnefs of the Metal 3 that firft melts, from that of the reft of 
the Metal which comes afterwards in the fame or another opera- 
tion ? And whether the Rule holds conftantly ? (For., though 
they obferve in Tin-Mine s 0 the beft Metal comes firft , yet in the 
works of an Induftrious friend of mine 3 he informs me 3 that the 
beft Metal comes laft.) 
85 4 Whether the produced Metal be all ofthe fame goodnefs? 
And if it be 3 how good it is in reference to the Metal of other 
Mines ? or other parts ofthe fame Mine or Vein? And if it benot 3 
what differences are obferv'd between the produced portions 
of Metal 5 and what difparity that amounts to in the price ? 
86 . What are the Wayes of diftinguifhing them 5 and efti* 
mating their goodnefs ? 
87. Whether they do any thing to the Metal 3 after it is 
once brought to Fufion 3 and 3 if need be 3 melt it over again* 
to give it a melioration ? ( As when Iron is refined 3 and turn’d 
into Steel 5 ) And what diftinct Furnaces 3 and peculiar Ways 
of ordering the Metals are employ’d to effeift this improvement? 
With a full defcription of them and the Tools in all Circumftan- 
ces 3 obferv’d in the refining of Metals. 
88 . ' Whether in thofe places 3 where the Metal is melted, 
there be not elevated fome Corpufcles 3 that ftick to the upper 
parts ofthe Furnance 3 or Building? And 3 if there be 3 whe- 
ther they be barely fuliginous and recrementitious exhalations* 
'or, at leaft in part 3 Metallio Flowers ? ( As in the Cornijh Tin- 
mines, after fbme years they ufually deftroy the thatch’d 
Houles 3 where the Ore hath been melted , to get the fluff, that 
adhears to the inlides ofthe Roofs, out of which they melt ftore 
of excellent Tin . ) 
Sp. Whether the Metals being brought to fufion , affords 
' any 
