wrap up in within lead. If it be silver, they put such a quantity of that
alone and wrap it up in lead, and then putting them into little earthen
cupps made of stuff like tobacco pipes, and put them into a burning hot
furnace, where, after a while, the whole body is melted, and at last the
lead in both is sunk into the body of the cupp, which carries away all the
copper or dross with it, and left the pure gold and silver embodyed
together, of that which hath both been put into the cupp together, and the
silver alone in these where it was put alone in the leaden case. And to
part the silver and the gold in the first experiment, they put the mixed
body into a glass of aqua-fortis, which separates them by spitting out the
silver into such small parts that you cannot tell what it becomes, but
turns into the very water and leaves the gold at the bottom clear of
itself, with the silver wholly spit out, and yet the gold in the form that
it was doubled together in when it was a mixed body of gold and silver,
which is a great mystery; and after all this is done to get the silver
together out of the water is as strange. But the nature of the assay is
thus: the piece of gold that goes into the furnace twelve ounces, if it
comes out again eleven ounces, and the piece of silver which goes in
twelve and comes out again eleven and two pennyweight, are just of the
alloy of the standard of England. If it comes out, either of them, either
the gold above eleven, as very fine will sometimes within very little of
what it went in, or the silver above eleven and two pennyweight, as that
also will sometimes come out eleven and ten penny weight or more, they are
so much above the goodness of the standard, and so they know what
proportion of worse gold and silver to put to such a quantity of the
bullion to bring it to the exact standard. And on the contrary, [if] it
comes out lighter, then such a weight is beneath the standard, and so
requires such a proportion of fine metal to be put to the bullion to bring
it to the standard, and this is the difference of good and bad, better and
worse than the standard, and also the difference of standards, that of