unning under it, or falling on it? And what are, the Dimensions,
Situation, &c. of the Bellows?

79. What contrivance they have, to let or take out the Metal, that is in
fusion; and cast it into Barrs, Sows, Pigs, &c?

80. What Clay, Sand, or Mould they let it run or pour it through? And after
what manner they refrigerate it?

8l. Whether or no they do, either to facilitate the fusion, or to obtain
the more or better Metal, mingle differing sorts or degrees of Ore of the
same metal? (As in some places 'tis usual, to mingle poor and rich Ore; and
at _Mendip_ they mix two or more of these differing kinds of _Lead-ore_
that they call _Frim-ore_, _Steel-ore_, _Potern-ore_, &c.) {341}

82. Whether or no, having once brought the Ore to fusion, they melt all the
Metal it self, to have it the more pure? And, if they do, with what
circumstances they make the fusion?

83. Whether they have any Signs, whereby to know whether the Fusion have
been well or ill perform'd; and the Metal have obtain'd the perfection, to
be expected from such Ore, melted in such a Furnace?

84. Whether they observe any great difference in the goodness of the Metal,
that first melts, from that of the rest of the Metal which comes afterwards
in the same or another operation? And whether the Rule holds constantly?
(For, though they observe in _Tin-Mines_, the best Metal comes first, yet
in the works of an Industrious friend of mine, he informs me, that the best
Metal comes last.)

85. Whether the produced Metal be all of the same goodness? And if it be,
how good it is in reference to the Metal of other Mines, or other parts of
the same Mine or Vein? And if it be not, what differences are observ'd
between the produced portions of Metal; and what disparity that amounts to
in the price?

86. What are the Wayes of distinguishing them, and estimating their
goodness?

87. Whether they do any thing to the Metal, after it is once brought to
Fusion, and, if need be, melt it over again, to give it a melioration? (As
when _Iron_ is refined, and turn'd into Steel;) And what distinct Furnaces,
and peculiar Ways of ordering the Metals are employ'd to effect this
improvement? With a full description of them and the Tools in all
Circumstances, observ'd in the refining of Metals.

88. Whether in those places, where the Metal is melted, there be not
elevated some Corpuscles, that stick to the upper parts of the Furnace, or
Building? And, if there be, whether they