Si.Whetheror no, having once brought the Ore tofufion^ 
they melt all the Metal it fclf to have it the more pure ? And? 
if they do^ with what circumftances they make the fufion t 
8 3. Whether they have any figns 3 whereby to know vvhe- 
ther the Fufion have been well or ill perform'd ; and the Metal 
have obtained the perfedlion^ to beexpefted from fuch Ore, 
melted in fuch a Furnace > , 
84. Whether they obferve any great difference in the 
goodnefs of the Metal, that firft melts^ from that of the reft of 
the Metal which comes afterwards in the fame or another ope- 
ration ? And whether the Rule holds conftantly ? (For^though 
they obferve in Tin-mine s.xkit beft Metal comes firft, yet in the 
works of an Induftrious friend of mine,he informs me thsit the 
beft Metal comes laft* ) ' 
8 54Whether the produced Metal be all of the fame goodnefi ? 
And if it be, how good it is in reference to the Metal of other 
Mines,or other parts of the fame Mine or VeiD?And if it be nor, 
what differences are obferv'd between the produced portions 
of metal ; and what difparity that amounts to in the price ? 
85. What are the wayes of diftinguiihingchemjandeftima* 
thig their goodnefs ? 
87. Whether they do any thing to the metal , after it is 
once brought to Fufion 3 and, if need be^ melt Jt over again ^ 
to give it a melioration? (As when Iron is refined, and tarn'd 
into Sreel 3 ) and what diftind Furnaces^ and peculiar Wayes 
of ordering the metak are employ 'd to effed: this improve- 
ment ? With a full defcription of them and the Tools in all Cir* 
cumftancesj obferv'd in the refiriing of metals* 
88. Whether in thofe places 5 v/here the metal is melted ^ 
there be not elevated fome Corpufcles^ that flick to the upper 
parts of the Furnace 3 or Building? And^ if there be^ whe» 
ther they be barely fuliginous and recrementicious exhalations 
or at leaft in part^ metalui Flowers ? ( as in the Cormjlo Tin- 
mines , after fome years they ufually deftroy the thatch'd. 
HoufeSjWhere the Ore hath been melted, to get the fluff that 
adhears to the infides of the Roofes^ out of which they mek 
ftore of exce llent Tin.) 
89. Whether the metal being brought to fufion, affords 
any 
