1Then the stannum runs out of the furnace into the forehearth; this is an
alloy
of lead and silver. From the silver-lead alloy they first skim off the slags,
not rarely white, as some pyrites49 are, and afterward they skim off the
cakes of pyrites, if there are any. In these cakes there is usually some copper;
but since there is usually but a very small quantity, and as the forest
of lead and silver. From the silver-lead alloy they first skim off the slags,
not rarely white, as some pyrites49 are, and afterward they skim off the
cakes of pyrites, if there are any. In these cakes there is usually some copper;
but since there is usually but a very small quantity, and as the forest